Bicycle Braking Systems

bike Braking Systems Year 11 Engineering Studies Merewether High School Nathan Dunshea 29/06/2012 Abstract In this cross a comparison of three Braking clays measure out, Drum and disc will be make on a variety of argonas including * * Effectiveness * Performance * Features * Materials * Frictional Components * variety from comparable car systems An Orthogonal and Pictorial drawing will also be appendd on a selected section of one of the braking systems macrocosm comp atomic number 18d. Introduction Bicycle Braking systems ar a means of which we be able to halt the movement of a oscillation through the expulsion of ki assoilic competency.The Kinetic potential energy that is present in a moving bicycle is converted in to 3 discordent forms of energy high temperature, sound and light. This is done through the resistance of a wheel to move when a halt applies a frictional tug against the spin movement of a wheel. Three different types of stop ar chiefly used on bicy cles today the Calliper, Drum and magnetic disk systems. These three habitual braking systems lose their own unique set of advantages and disadvantages that persuade the population to purchase them. 2 Calliper brake Diagram Calliper Brake Diagram 3 Disc Brake Diagram 3 Disc Brake Diagram 4 Drum Brake Diagram 4 Drum Brake Diagram Procedure I used the Internet to research pictures, articles and suppliers of Braking systems in order to entrance the appropriate information needed for this report. Results Effectiveness, Performance, Features Comparison Effectiveness 10 Cross-Section of a bicycle bbl pasture brake 10 Cross-Section of a bicycle beat out brake The effectivity of these Braking systems will be a mea sure of their cleverness to perform over a period of time.It is necessary for these brake not to only perform well once, but over many instances, including moments of hard excessive braking. In todays modern bicycle, many things will assume the braking systems ability to be effective. The weather, wear and tear over many uses, as well as the type of braking taking place can all encounter adverse effects on brake system. Drum brakes are not the most popular style of brake for a bicycle. This could be accredited to their durability over time compared to both caliper brakes and dish antenna brakes. Drum halt are typically very heavy, complicated to perform maintenance on and are often subject to brake fading.Break fading can be defined as the loss of braking force able to be exerted by the braking system at any point, and this often happens due to overheating as a result of consistent hard braking. Drum brakes are unable to inject heat anywhere near as efficiently as disc brakes as the frictional forces that turn kinetic energy into heat are all enclosed within the drum itself, which is often housed at the hub of the wheel. In fact, many companies take a shit been forced to put warning labels on their hubs to make sure children arent unawar e of the heat generated, and subsequently burn themselves.This makes them particularly susceptible to brake fading, something that both disk and caliper brakes dont check a great problem with. In adverse weather conditions, the drum brake can show of its unique asset both the disc and calliper brake does not have. The Drum brake is fully enclosed, and hence is not affected by rain, mud and other substances that may impede the frictional force exerted on the wheel. 12 Disc brake to be fitted to a mount bike 12 Disc brake to be fitted to a Mountain Bike Disc Brakes are very popular on Mountain Bikes, which require thick wheels and are often subject to muddy terrain.Because the disc brake is mounted to the hub, a certain clearance from the ground is maintained at all times, generally keeping mud from obstructing the make outs and disc. If water is to get stuck under a disc brakes pad, at that place are generally holes through which it can quickly escape so to not compromise the f riction produced in the system. Touring bikes have been known to prefer disc brakes to types of calliper brakes, as the long journeys and significant use of brakes would not wear out the bound as they do using a calliper brakes system.The typical Disc Brake system is a very adaptable structure as it can perform better than Calliper Brakes in the mud, rain and snow as the coefficient of friction isnt as at risk of contaminants upset the system. Disc brakes are also less prone to brake fading when subject to long periods of braking pressure, as they are very good at cooling down compared to drum and calliper brakes. A disk brake is also less likely to cause a popped tyre, with the heat not being dissipated directly into the tyre as in calliper brakes. 14 Shimano Bicycle Caliper Brake 14 Shimano Bicycle Caliper BrakeCalliper Brakes are generally the most common of the braking system for the day-after-day bicycle. Excluding the original design quality of the equipment and materials, calliper brakes are often affected mostly by the moisture that is on the rim, as that will significantly hinder the ability to stop. Tyre thickness can also pose a problem to the calliper braking system, as the arms will be under great flexion, thus lessening brake effectiveness. However, the Calliper brake system is effective on the bonnie road bike and is the simplest and easiest to perform maintenance on of all three designs.This system also has a very big mechanical advantage, core very little effort has to be put in by the rider in order to properly apply the brakes. Calliper brakes are also by far the lightest and least expensive, making them popular among non-competitive riders, with most road bikes still come fitted with this system. Performance The performance of a braking system is establish on the raw stopping powerfulness and ability for one superstar use. This comparison will be based purely on stopping power and performance, disregarding things such as * Weight of system * Weather/Terrain Brake Fading * Heat Dissipation The Disc Brake is said to have the greatest stopping power, and therefore provides least stopping distance, of all three systems. This means they are often fitted to competitive riders bikes, because they are often going a higher(prenominal) speed and therefore need the greater stopping power that the disc brake provides compared to that of the drum and calliper braking system. In a report By clapperclaw Kesteven for UK organisation What Mountain Bike, a variety of disc brakes were tested from many different manufacturers to test the power of each system.The test was performed as follows All the brakes were tested with a 180mm rotor and a 50Nm force on the lever (1N is the amount of force required to accelerate 1kg at 1m/s2), with the business pads. To fully bed in the rotors and pads, the brakes were given 60 one-second pulls at 15km/h, followed by 30 two-second pulls at 20km/h. After a 30-second cooling-down period, the t esting began. With the wheel spinning at 30km/h, each brake was applied for three seconds and then left to recover for 10 seconds. This cycle was repeated 15 times. The results were then averaged out to provide a single power rating. Guy Kesteven What Mountain Bike. After the test had been completed, the Formula R0 disc braking system had the greatest power of all 33 move tested. It was found to have a power of 124 Nm when stopping, which is equal to 12. 645 kilogram-force meters. Calliper Brakes have one of the best designs in terms of their Mechanical Advantage. actually little effort has to be put in by the user to have the brakes perform as well as possible. Disc Brakes have an overall stopping power advantage over the general calliper brake, however some versions of the calliper brake have a greater stopping power than the drum brake design.With the huge variety of designs in the field of Calliper Brakes, stopping power can range from quite brusque to very high. An example of this stopping power is the test carried out by Matt Pacocha in the June 2009 edition of Velonews. A group of Bicycle Calliper brakes were to be tested to measure their stopping power This test was performed on a flat, windless road. For each brake, the rider accelerated to 40km/hr then grabbed the brakes hard on a pre-determined mark and recorded stopping distance.This test was performed 10 times for each brake, and the stopping distances were averaged. Matt Pacocha Velonews. At the end of the test, the Shimano 7900 ternary pivot calliper brake was found to have the greatest braking force, with the shortest stopping distance of 7. 18 metres. It was also found that the average deceleration of the bicycle was 8. 59 m/s2, whilst the greatest deceleration was recorded at 10. 35 m/s2 (Over 1 G-force). Drum Brakes are less powerful than the disc brake, and therefore have a greater stopping distance in normal, controlled conditions.Compared to Calliper brakes it is not clear-cut wh ich has a better stopping distance, as there are many different versions of each type of brake to choose from. However, it is said that the modern drum brake is able to provide a oft smoother, more reliable deceleration than the majority of calliper brake systems. Features Each of these braking systems have their own singularitys which help to enhance the ability to stop the movement of a bicycle. Whilst some of these advantages are purely performance based, others may have features that are cost-effective or maintenance friendly.One of the most important features in the success of the disc brake is its ability to dissipate the heat generated from the frictional forces. Disc brakes are out in the open air with a large lift area, meaning the cooling process happens more quickly and efficiently. Another important, yet perhaps underestimated feature of the disc brake is its positioning. Disc brakes are well away from the tyres and ground, thus creating distance between the braking s ystem and mud, dirt and other potential environmental interferences.Drum brakes however, are certainly the best in resisting those environmental factors. As the braking mechanism itself is housed within a shell of sorts, no amount of weather can have an adverse effect on the ability of the drum brake to perform its task. Once installed, drum brake system is also very low maintenance, and often doesnt have to be managed again until a new wheel is needed. scorn this, Drum Brakes can be a hassle if maintenance must(prenominal) occur, as they can be difficult to access because of the shell it is housed in. Calliper Brakes are generally the cheapest of the three designs available.As they are often mounted to the bicycle at one single point, accessing the brake pads and cables is made much easier than the other systems. Another feature that is useful on the majority of road bikes with calliper brake systems is the quick release mechanism. This feature is designed as to loosen the brake system enough so the wheel can be removed without having to mess around with loosening brake cables as well. Materials used for construction and frictional components Brake enlarges are perhaps the most important part of both the Disc and Calliper braking systems.The brake pad is generally made from a product that possesses a moderately high coefficient of friction, but also depends on the materials ability to absorb and dissipate the heat produced in the process of braking. If these criteria can be met without having a negative impact on overall braking performance, an appropriate material has been found. In years gone by, an asbestos based merge was the most common material from which brake pads would be made, however because of the toxic nature of asbestos that practise no longer allowed. The modern bicycle Brake Pad is enerally made from rubber compound. The rims on bicycles directly affect the performance of the Calliper braking Systems. Some bike rims today are made from an aluminium alloy, which provide a coefficient of friction when in contact with the rubber composite of the brake pads of approximately 0. 4. Other materials, such as various Carbon steels, have recently get more popular as they are light and aerodynamic. However, they do not provide a very good frictional force between the everyday brake pad, and so other materials are often preferred by the everyday cyclist.Calliper brake systems also have brake cables that transfer the motion activate by the rider from the brake lever to the braking system itself. These brake cables are made from thin wire steel that has been braided unitedly to improve its elastic effect and ability to perform. The Disc in the Disk brake system is an integral part of the bicycles stopping power. The Brake pad (rubber composite) must have a high enough coefficient of friction when applied to the disc to halt movement with damaging the surface.To provide this, the disc is made from metal, with stainless steel b eing popular among mountain bikes. A brake drum has an outer shell in which the braking system itself is contained. This outer shell is subject to weathering from the outside and heat from within. With this in mid, robust is generally the material chosen as it can cope with these two burdens other materials could falter under. The shoes of the Drum brake are the parts that stir up outwards to produce the frictional forces needed in the brake design.These brake shoes are generally made when two pieces of sheet steel are welded together. After they are welded together, the frictional material known as brake lining is connected on to the sheet steel with either adhesive resin or other means such as a rivet. It is also important to remember that the rubber composite of bicycle tyres also has frictional forces playing from the material it is rolling on. For instance, if a cyclist was riding along a concrete surface, the coefficient of friction would be 0. 8, much higher than that of r ubber or brake lining to metal (0. ). Thankfully, the relatively light weight of the human body compared to the force exerted by our mechanical braking systems allows us to still move along these surfaces. (FF = ? RN) How they differ from comparable car systems On most bicycles, the braking systems installed will often be very simplistic and just there to do the job. Most will have the same type of brake on both front and back wheel, with the braking of the bike mostly relying on human action with levers and cables, as well as the mechanical advantage some of these designs provide.However, when upgrading these systems to work on a much heavier vehicle such as a car, many things can change. It is not peculiar to have different types of brakes on the front and back set of wheels, and hydraulics become a very important part of stopping your car. In todays modern designs, at least one set Disk Brakes are fitted to almost every car on the road. Disk Brakes are the most effective type of braking system that we could fit to our cars, however, it is still common for the front brakes to be disk, but the rear to be drum brakes.Drum brakes can be used as the pose brake, and by fitting them to the rear of the car, companies can save money by not having to install another braking system. The Disc Brake in a car is obviously in a much larger scale than that of a bicycle. Despite this, the two systems are very similar in the basic design concept. Strength of this part however, must be much greater when installed in an Automobile. Winnard & Sons Ltd, a company based in the UK that deals with commercial vehicle braking components, has a guideline to the tensile strength on the brake contact surfaces of their products. Guideline tensile strength on test pieces machined from brake drum/disc contact faces 241 N/mm2 European Requirement minimum 35,000 psi Amercian Requirement minimum Winnard & Sons Ltd Brake Disc and Brake Drum Material Specification The materials used in t he brake pads of both the disk and calliper brakes are different when they are made for cars. When halting the momentum of a car, the brake pad is put under a much greater force than when stopping a bicycle. This is due to a number of things, including the speed at which the car is travelling and the mass of the vehicle, both of which are generally higher in cars.The metals used are usually steel, pig or brass fibres, as well as a mixture of many different composites including graphite, iron oxide, glass fibres, phosphate and rubber that are bonded together with a resin of phenol formaldehyde. The metals that are added help to increase life span by improving the ability of the compound to dissipate heat at high speeds. The complexity of all three designs is greatly heightened when moving from bicycle to motor vehicle. One aspect of Motor Vehicle braking that creates extra pressure is the hydraulic action of the brakes.Hydraulics rely on brake fluid, typically containing ethylene glycol, to transfer pressure from the controlling unit to the brake mechanism. In a motor vehicle, drum brakes often serve a specific purpose that they would be useless for when installed on a bicycle the park brake. As I stated earlier, these Drum brakes are fitted to the rear wheels and can save companies significant amounts of money by not having to install a completely separate parking brake. As this asset of an emergency brake is vital to a larger system, not only are they more common in cars, but they must also be bigger and exert a greater force.These three types of braking systems hold the same principles when applied to a greater size vehicle in a motor car, however many things must change to accommodate these increase forces. Conclusion Each of these three braking systems are often used by a specific type of bicycle with a specific need. An example of this is Disc brakes being preferred by those who ride either Mountain or Touring bikes. As shown by the two field tests r eferenced in this report, completed by Velonews and What Mountain Bike, both Calliper brakes and disc brakes both have a very big potential to have immense stopping power.But to have that stopping power, the proper materials with appropriate frictional forces would have had to been in place. At the absolute top of the line models, every little detail is considered, i. e. * * Weight * Frictional Forces * Materials * Angle * Type of System It was also ascertained that as we transition from bicycle to car braking systems, many things must be altered. Although the basic engineering principles are often the same, there are many variables that are altered to improve to braking systems to cope with the extra forces exerted by a motor vehicle.For example, the change in materials of brake pads to accommodate the much more intense levels of heat being produced when heavy braking is taking place. I believe this report reveals that the braking system you own can make a big difference on effect iveness and performance. The features, materials used and frictional forces in play can all be positive or negative depending on the type of riding taking place. Recommendations I recommend selecting one of these three types of braking systems based on what their use in the long run will be.If you plan to use the bike for competitive purposes when increased stopping power is necessary, I would suggest purchasing a Disc brake system. However, if the bike is simply for leisure, perhaps the more cost effective Calliper Brake system would better suit. If you are planning to ride in muddy areas where the possibility of substances interfering with the frictional forces throughout the braking system, the fully enclosed drum brake system could be the appropriate option. However, if you wish to simply have the greatest overall stopping power, I would recommend a Disk Brake system be installed. The most mportant thing to remember is that every situation is unique, and to do research in order to attain the correct brake for your needs. Bibliography * http//www. edmunds. com/car-technology/brakes-drum-vs-disc. hypertext markup language * http//www. bikewebsite. com/bicycle-bra. htm * http//www. jaxquickfit. com. au/brakes * http//www. exploratorium. edu/cycling/brakes2. hypertext markup language * http//bikeadvice. in/drum-brakes/ * http//www. sheldonbrown. com/gloss_dr-z. hypertext markup languagedrum * http//www. livestrong. com/article/340500-adjust-bicycles-drum-brakes/ * http//www. skyshop. com. au/LANDING. pdf * http//www. razyguyonabike. com/doc/page/? page_id=8174 * http//sheldonbrown. com/calipers. html * http//www. bicyclestore. com. au/parts/brakes/calliper-brakes. html * http//www. 123helpme. com/view. asp? id=57299 * http//www. bike-riding-guide. com/bicycle-brakes. html * http//eecycleworks. com/VNJune%20BrakeTest. pdf * http//auto. howstuffworks. com/auto-parts/brakes/brake-parts/brake-calipers2. htm * http//urbanvelo. org/torker-graduate-commuter-bike-revi ew/ * http//www. cycle-systems-academy. co. uk/index. php/topics/brakes/brakes-theory/mechanics-of-brakes/mechanics-of-the-system? tart=5 * http//www. physicsforums. com/showthread. php? t=158582 * http//www. longjohn. org/bremsen/bremsen_en. html * http//www. abcarticledirectory. com/Article/Bicycle-Brakes-Guide/786406 * http//www. cdxetextbook. com/brakes/brake/disc/brakefrictionmat. html * http//www. bikeforums. net/archive/index. php/t-302000. html * http//www. alibaba. com/showroom/aluminum-bike-rim. html * http//cars. about. com/od/thingsyouneedtoknow/a/discvsdrum. htm * http//www. fezzari. com/support/rb_brakes * http//bicycletutor. com/sidepull-caliper-brakes/ * http//www. icycling. com/bikes-gear/bikes-and-gear-features/big-squeeze-road-disc-brakes * http//www. unitconversion. org/moment-of-force/newton-meters-to-kilogram-force-meters-conversion. html * http//www. bikeradar. com/mtb/gear/category/components/disc-brake-systems/product/review-formula-ro-12-46051 * http//www. winnard. co. uk/downloads/twcbd1_material_specification_2011. pdf * http//www. autoshop101. com/forms/brake03. pdf * http//www. pbr. com. au/technical/documents/hydraulicbrakesystemsguide. pdf * http//www. tcbbrakesystems. com/hdopenroad-text. html * http//www. sae. rg/events/bce/presentations/2009/okamura. pdf auxiliary Braking Power test Matt Pacocha, Velonews June 2009 Braking Power test Matt Pacocha, Velonews June 2009 What Mountain Bike UK Calliper Brake Power Testing 1 . http//www. edmunds. com/car-technology/brakes-drum-vs-disc. html 2 . http//www. bikewebsite. com/bicycle-bra. htm 3 . http//www. jaxquickfit. com. au/brakes 4 . http//www. jaxquickfit. com. au/brakes 5 . http//www. exploratorium. edu/cycling/brakes2. html 6 . http//bikeadvice. in/drum-brakes/ 7 . http//www. heldonbrown. com/gloss_dr-z. htmldrum 8 . http//www. livestrong. com/article/340500-adjust-bicycles-drum-brakes/ 9 . http//www. exploratorium. edu/cycling/brakes2. html 10 . http//sheldonbrown . com/sturmey-archer_3-spd. html 11 . http//www. skyshop. com. au/LANDING. pdf 12 . http//www. mountainbikestoday. com/mountain-bike-resources/should-my-mountain-bike-have-disc-brakes 13 . http//www. crazyguyonabike. com/doc/page/? page_id=8174 14 . http//sheldonbrown. com/calipers. html 15 . http//www. bicyclestore. com. au/parts/brakes/calliper-brakes. html 16 . ttp//www. fezzari. com/support/rb_brakes 17 . http//www. 123helpme. com/view. asp? id=57299 18 . http//www. bike-riding-guide. com/bicycle-brakes. html 19 . http//www. bikeradar. com/mtb/fitness/article/how-we-test-hydraulic-disc-brakes-24345/ 20 . http//www. unitconversion. org/moment-of-force/newton-meters-to-kilogram-force-meters-conversion. html 21 . http//www. cycle-systems-academy. co. uk/index. php/topics/brakes/brakes-theory/mechanics-of-brakes/mechanics-of-the-system? start=5 22 . http//eecycleworks. com/VNJune%20BrakeTest. pdf 23 . http//eecycleworks. om/VNJune%20BrakeTest. pdf 24 . http//auto. hows tuffworks. com/auto-parts/brakes/brake-parts/brake-calipers2. htm 25 . http//urbanvelo. org/torker-graduate-commuter-bike-review/ 26 . http//www. physicsforums. com/showthread. php? t=158582 27 . http//www. longjohn. org/bremsen/bremsen_en. html 28 . http//www. tcbbrakesystems. com/hdopenroad-text. html 29 . http//www. abcarticledirectory. com/Article/Bicycle-Brakes-Guide/786406 30 . http//bicycletutor. com/sidepull-caliper-brakes/ 31 . http//www. cdxetextbook. com/brakes/brake/disc/brakefrictionmat. html 32 . ttp//www. alibaba. com/showroom/aluminum-bike-rim. html 33 . Paul L. Copeland, Engineering Studies The classic guide 34 . http//www. bicycling. com/bikes-gear/bikes-and-gear-features/big-squeeze-road-disc-brakes 35 . http//www. bicycling. com/bikes-gear/bikes-and-gear-features/big-squeeze-road-disc-brakes 36 . http//www. autoshop101. com/forms/brake03. pdf 37 . Paul L. Copeland, Engineering Studies The Definitive guide 38 . Paul L. Copeland, Engineering Studie s The Definitive guide 39 . http//cars. about. com/od/thingsyouneedtoknow/a/discvsdrum. htm 40 .

Dear Wife Analysis

John Downes garner to his married woman creates an enthusiastic, persuasive tone to try to change her to leave England and come to the United States. The diction he uses and the way he structures his sentences highlights the extremums he tries to make. He uses an depart of rhetorical strategies and devices such as imagery, tone and attitude, and condolence to do so.Throughout most of the letter, Downe describes to his wife the lifestyle in the United States through imagery. The diction he uses gives a comforting, welcoming visual of what the United States has in descent for his wife and family. Most of the persuading goes on in the first paragraph as he exemplifies all the commodious opportunities with leaving England and coming to the United States. He gives his wife a sense of security when he explains that people in the United States do not gravel to close or lock their doors and can venerate their lives doing whatever they like, from picking fruits to going to place a drink. He gives her something to look forward to by describing the beauty of the States and sharing his experiences.In the second paragraph, Downe gets into a more(prenominal) personal aspect with his word choice and sentence structure through pathos. Short, direct sentences are utilize to get his point across to his wife. He exemplifies his mourning and remorse for leaving the family during his time of hardship and explains that he is back on his feet due to his choice of touching to the United States and starting a wholly bare-assed life. Downe uses this to explain to his wife that her life can be changed if she comes also. He repeatedly used the word near(a) to refer to his wife and family and to make a point to personally address his wife.Downes tone and attitude throughout the whole letter is persuasive. It is important for him to get his family to move to the United States and enjoy a whole new life together. From describing the market place to trying to degrade Engla nd, his sole purpose is to convince his wife that the United States is a better place for her and his family. He takes a shot at England when he said, that there is no improper or disgusting compare in the United States compared to England. He ends the letter with feeling when he tells his wife to give the children a kiss for him.John Downe uses different rhetorical strategies to try to persuade his wife to move to the United States from England. He paints an image of America that is welcoming and warm. His tone is very persuasive and he uses pathos to form a connection with his wife.Dear Wife AnalysisJohn Downes letter to his wife creates an enthusiastic, persuasive tone to try to convince her to leave England and come to the United States. The diction he uses and the way he structures his sentences highlights the points he tries to make. He uses an array of rhetorical strategies and devices such as imagery, tone and attitude, and pathos to do so.Throughout most of the letter, Do wne describes to his wife the lifestyle in the United States through imagery. The diction he uses gives a comforting, welcoming visual of what the United States has in store for his wife and family. Most of the persuading goes on in the first paragraph as he exemplifies all the great opportunities with leaving England and coming to the United States. He gives his wife a sense of security when he explains that people in the United States do not have to close or lock their doors and can enjoy their lives doing whatever they like, from picking fruits to going to get a drink. He gives her something to look forward to by describing the beauty of America and sharing his experiences.In the second paragraph, Downe gets into a more personal aspect with his word choice and sentence structure through pathos. Short, direct sentences are used to get his point across to his wife. He exemplifies his regret and remorse for leaving the family during his time of hardship and explains that he is back on his feet due to his choice of moving to the United States and starting a whole new life. Downe uses this to explain to his wife that her life can be changed if she comes also. He repeatedly used the word dear to refer to his wife and family and to make a point to personally address his wife.Downes tone and attitude throughout the whole letter is persuasive. It is important for him to get his family to move to the United States and enjoy a whole new life together. From describing the market place to trying to degrade England, his sole purpose is to convince his wife that the United States is a better place for her and his family. He takes a shot at England when he said, that there is no improper or disgusting equality in the United States compared to England. He ends the letter with emotion when hetells his wife to give the children a kiss for him.John Downe uses different rhetorical strategies to try to persuade his wife to move to the United States from England. He paints an ima ge of America that is welcoming and warm. His tone is very persuasive and he uses pathos to form a connection with his wife.

Persuasive Communication Theory

weighty converse Theory in social psychology A Historical Perspective Icek Ajzen University of Massachu drawts Amherst From M. J. Manfredo (Ed) (1992). Influencing Human Behavior Theory and Applications in Recreation and Tourism (pp 1 27). Champaign, IL Sagato a slap-uper extent Publishing. Persuasive dialogue Theory summon 1 Few subjects in social psychology fall in attracted as ofttimes interest and attention as persuasive communion. angiotensin converting enzyme of the first topics to be systematically investigated, position has been the focalize of intense look for efforts throughout much of social psychologys brief scientific history.Untold experiments defecate been conducted to unravel the mixed web of factors that appear to play a fictional character in determining the long suit of a persuasive pith. These attempts eat up revealed a microscope stage of complexity that sop upms to balk explanation and that poses serious obstacles to system construction. However, young years have seen considerable progress at the theoretical level and a resurgence of empirical turn tail has d iodin much to invigorate the field and ply a better understanding of the fundamental psychological processes underlying ruling.To appreciate the signifi bunsce of these developments we must analyse the emerging ideas and explore findings with those from earlier efforts. The present chapter is designed to provide the required historical perspective. Since it aims to re see to it developments in our understanding of the thought process process, emphasis is placed on ideas and theories alternatively than on methodological or practical concerns empirical question findings be summarized altogether in broad outline when necessityed to nark a point of theoretical signifi ejectce.The solution of problems created by recreation and tourism often involves persuasion in virtuoso and only(a) form or an different. As the chapters in the molybdenum part of th is book illustrate, recreationists must be persuaded to observe rules of safety, to avoid conflicts with otherwise visitors, and to keep their impact on the environment to a minimum. Although social psychologists have seldom tested their ideas in the context of recreation and tourism, the findings and conclusions discussed be scurvy have obvious implications for any attempt to act upon opinions, military postures, and doings in this domain.THE NATURE OF PERSUASION Persuasive communication involves the delectation of verbal mental objects to forge attitudes and way. Although the context of persuasion must necessarily be considered, the verbal mental object, designed to sway the hearts and minds of the receivers, is at the core pigeonholing of persuasive communication. Through a process of reasoning, the means exerts its influence by force of the tunes it contains. As we shall see below, this emphasis on reasoning sets persuasive communication apart from other social in fluence strategies.Structure of a Message As a general rule, a message consists of three parts An advocated speckle, a set of general personal credit lines in support of the advocated position, and specific factual show up designed to bolster the general bloods (Fishbein and Ajzen, 1981). The advocated position whitethorn be a stand on a particular issue (e. g. , support for a tax increase) or a recommended action (e. g. , donating blood). The general arguments leave alone typically supply reasons for adopting the advocated position, and justification for the arguments is provided in the form of factual evidence.Consider the question of instituting a of age(p) comprehensive examination for undergraduate college students. Petty and Cacioppo (1986, pp. 54-59) published rough examples of general arguments and supportive evidence they have use in their research program. Among the major arguments contained in Petty and Cacioppos messages were the claims that instituting a comprehe nsive exam raises students grade point averages and leads to improvement in the quality of undergraduate teaching. The factual evidence in support of the first argument was formulated as follows (pp. 4-55) The National Scholarship Achievement dialog box recently revealed the results of a five-year choose conducted on the arrangeiveness of comprehensive exams at Duke University. The results of the think over showed that since the comprehensive exam has been introduced at Duke, the grade point average of undergraduates has increased by 31%. At comparable schools without the exams, grades increased by only 8% over the same period. The prospect of a comprehensive exam clearly seems to be effective in challenging students to pop off harder and faculty to teach to a greater extent effectively.It is likely that the benefits observed at Duke University could also Persuasive communicating Theory Page 2 be observed at other universities that adopt the exam policy. If accepted as valid , the factual evidence should result in acceptance of the argument that instituting a senior comprehensive exam get out raise grade point averages, and acceptance of the argument in turn should increase the likelihood that receivers bequeath endorse the position in favor of instituting a comprehensive exam, as advocated in the message.Thither is, of course, no assurance that receivers of a message will in fact accept the arguments and evidence it contains. On the contrary, identifying the factors and conditions that produce acceptance of learning contained in a message is the major purpose of persuasion theory and research. Alternative Influence Strategies In order to develop a better understanding of the nature of persuasion, it is find outive to contrast persuasion with a a couple of(prenominal) alternative influence strategies. The re behold offered here is far-off from exhaustive but it will help highlight some critical aspects of persuasive communication.Coercive judgem ent commonwealth can be induced to behave in a prescribed way by offering a sizable reward for compliance or by threatening severe punishment for noncompliance. This system of transplant can be very effective in producing the desired behavior, but its effectiveness is particular on supervision (French and Raven, 1959) and has few lasting effect on beliefs or attitudes. Enduring attitude heighten by means of coercion is more likely in the context of total institutions, such as prisons, mental hospitals, or prisoner-of-war camps.Situations of this kind enable control over many aspects of an individuals life for an ex slanted period of time. Even here, however, enduring attitude vary is rough to obtain and often fades after(prenominal) release from the institution (see Schein, 1961). Hypnosis and Subliminal Perception Instead of trying to overcome confrontation to replace by force of coercion, one can attempt to circumvent conscious opposition by means of hypnosis or presen tation of subliminal messages. Posthyp nonic induction can be used to instruct individuals upon awakening to engage in specified behaviors or to hold hot attitudes (e. . , Rosenberg, 1956). There is, however, some question as to whether hypnosis actually represents an altered state of intelligence that can be used to circumvent mountains usual resistance to manipulation of their beliefs and actions (cf. Barber, 1965 Wagstaff, 1981). Use of subliminal perception to bring well-nigh change is withal problematic. Its effectiveness depends on the presentation of information at an intensity level too low for conscious perception, yet high enough for it to enter unconscious or subconscious aw arness.Clearly, such a fine balance demands careful calibration and, given individual differences in perceptual acuity, whitethorn not be accomplishable in a mass communication context. In any event, even when subliminal perception can be based, its effects on attitudes and behavior tend to be of rather small magnitude (cf. Erdelyi, 1974). Conditioning and Affect Transfer Another way of trying to avoid resistance to change involves the use of condition procedures. It has been argued that attitudes can be changed by means of classical condition (e. . , Staats and Staats, 1958) and that behavior can be influenced through the systematic use of reinforcements in an instrumental conditional paradigm (e. g. , Krasner, 1958). Since the utility of conditioning in comparison to direct persuasion rests on the assumed skill of conditioning to operate without awareness of the influence attempt, the finis to which individuals submitted to conditioning form hypotheses about systematic associations created in the conditioning paradigm is of crucial importance.Contrary to earlier claims, it now appears that there is no convincing evidence that heavy(a) human beings can be conditioned without awareness (cf. Brewer, 1974). An idea related to classical conditioning has emerged in the re cent marketing literature where it has been proposed (Batra and Ray, 1986 Mitchell and Olson, 1981) that positive or negative affect recruited by one stimulus (the advertising) can transfer automatically to an associated stimulus (the advertised brand). This Persuasive Communication Theory Page 3 ffect transfer, however, is assumed to top only when individuals have no other, more informed basis, for evaluating the brand in question (Shimp, 1981). Moreover, given the results of research on conditioning in human beings, it can be assumed that affect transfer, if it occurs at all, occurs only in the presence of awareness of the contingencies involved. Subterfuge obvious heuristic in a persuasion context has to do with the communicators credibility. The position advocated in a message whitethorn be accepted if the message comes from a highly liable book of facts but rejected if the source is perceived to wishing credibility.When using this rule of thumb, receivers accept or rejec t the advocated position or action without considering the merits of the arguments contained in the message. Conclusions Whereas the strategies discussed thus far all in one way or another try to prevent or neutralize awareness of, and thus resistance to, the influence attempt, the strategies considered here subtly manipulate the situation in order to promote a psychological state that leads muckle voluntarily to engage in the desired behavior.The foot-in-the-door technique (Freedman and Fraser, 1966) and other sales ploys are good examples of this approach. When using the footin-the-door technique, a small request SQ acceded to by about individuals SQ is followed by a much larger request. Due presumably to the commitment produced by agreeing to the small request, conformity with the large request tends to increase. An alternative scheme involves first confronting a person with an immoderately large request and then appearing to compromise by offering compliance with a smaller re quest.In a highly readable book, Cialdini (1988) describes a look of ways in which subterfuge of this kind can be employed to elicit behaviors that might otherwise not be coifed. Subterfuge strategies take advantage of peoples various needs to reciprocate any favor received, to be liked by others, to be coherent, and so forth. Compliance is secured without the benefit of discussing the merits or costs of the pass along action. Heuristics We have noted that change by means of persuasive communication is found on a careful deliberation of the pros and cons associated with an advocated position or ction. We shall see in subsequent sections, however, that receivers of a message sometimes build judgments about the advocated position without going through an elaborate reasoning process. Instead, they whitethorn rely on heuristics or rules of thumb to arrive at a conclusion (cf. Chaiken, 1980, 1987). The most Our discussion shows that social influence can operate in a variety of way s and that various strategies are available to take advantage of the different possibilities. Nevertheless(prenominal), persuasive communication occupies a unique position in the matrix of social influence.Of all the available strategies it is the only one that appeals to reason, attempting to bring about change and compliance by convincing the individual of the validity or legitimacy of the advocated position. This play can be much more difficult than, say, coercion, but it also has important advantages. Besides being more compatible with democratic and humanistic values, persuasive communication can produce profound and lasting change, a goal not easily attained by other means. THE PERSUASION CONTEXT No message appears in a vacuum.At a minimum, we can usually identify the source of a message an editor of a newspaper editorial, a attorney pleading a clients case forward a jury, or a movie star enquire for donations to a charity. The communicators identity, however, is only one o f the many factors that bring about the context of persuasive communication. Classical synopsis (Lasswell, 1948) has divided communication into several distinct aspects that can be summarized as who says what, how, and to whom. More formally these aspects are know as source, message, channel, and receiver factors together, they constitute the context of 1 persuasion.Source Factors Source factors are observed or inferred characteristics of the communicator. They take biological arrogates such as age, race, height, and sex behavioural features such as Persuasive Communication Theory Page 4 facial expressions, mannerisms, hand and body movements, and the way the communicator is dressed social properties such as income, power, and social status and constitution traits such as self-confidence and extraversion. The most frequently study source factors, however, are the communicators credibility and attr progressiveness.Credibility refers to the perceived expertise and trustiness of the communicator. In other words, does the communicator have the knowledge to provide an informed opinion on the issue in question and, if so, can he or she be trusted to present all relevant information in an unbiased fashion? As noted earlier, persuasion is generally assumed to increase with credibility. It has similarly been proposed that the sum of change is influenced by the attr activeness or lik major power of the source, whether attractiveness is defined in terms of physical features or psychological and behavioral characteristics.Receiver Factors On the turnabout end of the communication context, parallel to source factors, are characteristics of the receiver or listening to whom the message is addressed. These characteristics include the receivers personality traits, sex, social status, intelligence, involvement, and so forth. Any attribute of the audience, or combination of attributes, may provide a context that contributes to the effectiveness of the message. Channel Factors The context of the message is also defined by the means used to communicate it.Information can be communicated face-to-face, in writing, or by way of an audio tape or video tape. Note that although it is possible to hold the heart and soul of the message (the general arguments and factual evidence) constant crosswise channels, different modes of communication will often vary in terms of some of the context factors. For instance, the audience obtains more information about physical and behavioral characteristics of the source from face-to-face or video messages than when the information is presented in scripted or oral form.Thus, it may be difficult in some instances to determine whether differences in persuasion are due to variations in the communication channel or to associated contextual differences that may confound the observed effect. Message Factors Potential confounding of a more serious kind can occur in the case of message factors because variations message featur es are often accompanied by differences in content. Message factors concern the ways in which information is communicated to the audience.Among the factors that have been considered are the order in which arguments are presented, one- versus twainsided presentations, and emotional versus nonemotional appeals (e. g. , humorous messages or messages that arouse fear versus neutral messages). To see why variations in message characteristics are often confounded with differences in message content, consider the case of one- versus two-sided communications. Clearly, to present both sides of an issue, an effective message must contain information and arguments not contained in a message that supports only the advocated position.In a twosided message, the communicator mentions arguments that could be used to support the opposite side and then proceeds to refute those arguments. In addition, of course, the communicator also discusses the arguments in favor of the position advocated in the m essage. Only this part is the same as or similar to the one-sided message. In the case of emotional versus neutral appeals, problems of confounding occur because humorous or fear-arousing communications generally contain information and arguments specifically designed to generate these emotions.It is thus difficult to separate the effects of fear or humor from the effects due to differences in the information contained in humorous versus nonhumorous messages or in high- versus lowfear messages. Situational Factors The persuasion context contains several situational variables that do not fit easily into the conventional framework of source, message, channel, and receiver factors. Among these situational variables are distraction and forewarning. Distraction can be the result of environmental noise, or it can be internal as when a person is preoccupied with other concerns.Forewarning refers to the availability Persuasive Communication Theory Page 5 of information before exposure to t he message, which warns the receiver either that an influence attempt is imminent or that the communicator is planning to advocate a certain position. In either case, forewarning may prepare receivers to rally their defenses against the forthcoming message. The Hovland usage Scientific work on persuasive communication began in earnest during World War II in an attempt to determine the effects of war-time propaganda (Hovland, Lumsdaine, and Sheffield, 1949).This was followed by a period of intensive experimental research at Yale University in the 1950s under the focal point of Carl Hovland (Hovland, Janis, and Kelley, 1953 Sherif and Hovland, 1961). Although it was extremely prolific and highly influential, the program of research initiated by the Hovland meeting produced very few generalizable conclusions. By the late 1960s, disappointment with this approach had become widespread (see Eagly and Himmelfarb, 1974 Fishbein and Ajzen, 1975). In this section we review the major lines o f work in the Hovland tradition and consider some of the reasons for its bankruptcy.Theoretical Orientation The empirical work of the Hovland group was guided by a loose theoretical analysis based on learning principles, and by a conceptual framework that incorporated context variables (source, message, channel, and receiver factors), seat variables (immediate attitude change, retention, behavior change), and mediating processes (attention, wisdom, and acceptance) (see McGuire, 1969, 1985). Very briefly, the theoretical analysis assumed that attitude change involves learning a new response to a given stimulus (the attitude object).Exposure to a persuasive message suggests the new response (the advocated position) and provides an opportunity to practice the response. The various contextual factors were assumed to facilitate learning by reinforcing and firmly embedding the new response in the receivers response hierarchy. empirical query The conceptual framework of context, target, and mediating variables served to organize thinking about the persuasion process. However, much of the empirical research in the Hovland tradition dealt primarily with the impact of contextual factors.Thus, in the 1950s and 1960s, hundreds of studies were conducted to examine the effects of source credibility and attractiveness receiver intelligence, self-esteem, and involvement fear appeals and order of presentation distraction and forewarning and a multitude of other contextual variables (see McGuire, 1985 for a recent review). Little attention was devoted to the dependent variable that serves as the target of the communication, although persistence of change over time was an early concern (see Cook and Flay, 1978). Of the mediating variables, only attention and comprehension were directly assessed.Thus, many studies contained a recall or recognition test to whole step the degree to which the message was received (McGuire, 1968), that is, the degree to which the message was atte nded to and comprehended. Generally speaking, the purpose of the test was to make sure that reception did not vary across conditions of the experiment, and that whatever effects were observed could not be attributed to differences in reception. In other words, the goal was usually to rid the experiment of the mediating effect of reception, rather than to study reception in its own right.Note also that the conceptual framework had little to say about the content of persuasive communication and what its role in the persuasion process might be. Message content was treated largely as a given, while the questions addressed had to do with the effects of contextual factors on the amount of change produced by the message in question. We shall see below that this approach to the study of persuasive communication was one of the major reasons for the failure of the Hovland tradition. make of source factors.One of the first lines of research initiated by the Hovland group dealt with the effect s of communicator credibility (Hovland and Weiss, 1951), and innumerable studies since have manipulated this variable. Of all the contextual factors examine in the Hovland tradition, variations in source credibility have produced the most arranged findings. By and large, communicators high in expertise and trustworthiness tend to be more persuasive than communicators with low standing on these factors. However, even here, somePersuasive Communication Theory Page 6 contradictory evidence has been reported. Source credibility does not always increase the amount of change, and in some situations it can even have a negative effect (cf. McGuire, 1985, p. 263). Other source characteristics are generally found to have no simple or easily predictable effects on persuasion. The communicators attractiveness, education, intelligence, social status, and so on can serve as cues for inferring expertise and can thus affect persuasion.However, these mediate effects do not appear to be steadfast enough to produce consistent results across different investigations. Effects of receiver factors. Age, gender, intelligence, self-esteem and other individual differences among receivers are rarely found to have strong effects on persuasion, and the results of different investigations are often inconsistent. Moreover, receiver factors are found to act in complex ways with each other and with additional factors such as the complexity of the message, the type of arguments used, the credibility of the communicator, and so on.Effects of channel factors. A rather discouraging picture also emerged with respect to the effects of the medium of communication. While visual messages tend to be better liked and attended to than spoken or written messages, recall is sometimes better for written material, and adding pictures to print can be distracting (see McGuire, 1985, p. 283). In light of these contradictory effects, it is hardly surprising that empirical research on channel factors has pro duced largely inconsistent results.Effects of message factors. Some of the most complex patterns of findings are associated with message factors such as emotional versus nonemotional appeals, message style, and gild of message content. With respect to the latter, consider for example whether one should state the messages basic position at the outset or at the end. Stating it at the beginning may have the advantage of clarity, making the source appear more trustworthy, and of attracting the attention of receivers sympathetic to the advocated position.It can also have the disadvantage, however, of lowering interest and antagonizing receivers initially hostile to the advocated position (McGuire, 1985). Other message factors can have equally complicated effects. To illustrate, consider the degree to which the message arouses fear or concern. Contrary to expectations, initial research (Janis and Feshbach, 1953) showed a low-fear message to be more effective than a high-fear message in producing compliance with recommended dental practices.Later research, however, has often found the opposite effect, and many investigations have reported no differences between high- and low-fear messages (for reviews, see Boster and Mongeau, 1985 and Higbee, 1969). Similarly inconsistent findings have emerged with respect to the effects of humor in persuasive communication (see Markiewicz, 1974). Retrospective In light of largely inconsistent research findings concerning the effects of contextual variables, many investigators became discouraged with the Hovland approach.Thus, after editing a book on attitude change in 1974, Himmelfarb and Eagly reached the quest pessimistic conclusions After several decades of research, there are few simple and direct empirical generalizations that can be made concerning how to change attitudes. In fact, one of the most salient features of recent research is the great number of studies demonstrating that the empirical generalizations of earlier r esearch are not general, but contingent on conditions not originally apparent. (Himmelfarb and Eagly, 1974, p. 94. ) In fact, the complexity of the persuasion process noted by Himmelfarb and Eagly in their reference to contingencies has been a favorite explanation for the failure of the Hovland approach. This explanation holds that persuasion is influenced by so many different factors interacting with each other that only complicated, multidimensional research strategies can cope with the complexities. However, when investigators have studied higher-order interactions, no clear or replicable patterns have emerged.Indeed, there is serious doubt that the search for complicated interactions can ever be a viable strategy (cf. Cronbach, 1975 Nisbett, 1977). The role of the receiver. Besides failing to advance our understanding of the persuasion process, the complexity explanation had the Persuasive Communication Theory Page 7 unfortunate effect of hiding the basic shortcomings of the Hov land tradition and thus delaying the search for alternatives. As is usually the case, realizing where this approach went wrong is much easier in retrospect than it was at the time.Perhaps without meaning to, the Hovland group cast the receiver in a rather passive role whose task was to learn the information and recommended position presented in a message. Attention and comprehension would assure that the information was absorbed, and persuasion would thus follow automatically. This view of the receiver stands in clear contradiction to much that is known about information processing. People are far from passive receivers of information.Instead, they usually act on the information that is available, integrating it (Anderson, 1971), constructing interpretations of their own (Neisser, 1976), and going in many ways beyond the information given (Bruner, 1957). This is just as true in the domain of attitudes as it is in other areas of information processing. For example, research on impres sion formation has shown that people draw far-ranging inferences about the attributes of another person on the basis of very limited information (Asch, 1946 Fishbein and Ajzen, 1975 Wiggins, 1973).Such inferences are often said to rely on unquestioning theories of personality (Schneider, 1973) which might suggest, among other things, that if a person is said to be hostile, he is also likely to be rash, aggressive, and inconsiderate. Several other lines of research demonstrate more directly the potential importance of inference processes in persuasive communication. Thus it has been shown that a persuasive communication designed to produce a change in one belief will also lead to changes in other, related, beliefs (McGuire, 1960a Wyer and Goldberg, 1970).It is even possible to produce change by merely making people aware of inconsistencies among their beliefs or values (McGuire, 1960b Rokeach, 1971) in a process McGuire has termed the Socratic effect After reviewing their beliefs, pe ople tend to change some of them in the direction of increased logical consistency. In short, there is every reason to expect that receivers exposed to a persuasive communication may engage in an active process of deliberation that involves reviewing the information presented, accepting some rguments, rejecting others, and drawing inferences about issues addressed that go beyond what was mentioned in the original message. The image of the passive assimilator fostered in the Hovland tradition is thus highly misleading, and misses the most important aspect of persuasive communication the receivers capacity for reasoning and for being swayed by the merits of a well-presented argument. Persuasion by the Peripheral road The passive-learner view of the receiver implicit in the Hovland approach block offe naturally led to a focus on the persuasion context.If the communicators task is to make sure that receivers learn and absorb the contents of the message, concern turns to a search for conditions that facilitate attention to the message and comprehension of its arguments, with a addendum lessening of interest in what the receiver does with the information that is received. Ironically, recent theory and research have established the potential importance of contextual factors, at to the lowest degree under certain wellspecified conditions. Once we realize what these conditions are, we can begin to understand the reasons for the inconsistent findings of research conducted within the Hovland paradigm.In the previous section we emphasized the active role of the receiver who may engage in an elaborate process of reasoning about the merits of the arguments presented in the message. This view assumes, first, that receivers are in fact sufficiently do to exert the required cognitive effort and, second, that they have the ability to carefully process the incoming information. It now appears that contextual factors influence persuasion only when one or both of these cond itions are not met (Chaiken, 1980 Petty and Cacioppo, 1981, 1986).Motivation to process the message and elaborate on it is largely a matter of the receivers involvement. Different aspects of the self may be activated in a given situation, depending largely on the issue addressed, and as a result, different kinds of involvement can be generated. Specifically, the message may create involvement by dealing with receivers enduring values, with receivers ability to obtain desirable outcomes or avoid undesirable outcomes, or with the impression receivers make on others Persuasive Communication Theory Page 8 (Johnson and Eagly, 1989).However, when the message has few implications for enduring values, for important outcomes, or for selfpresentation, it produces little motivation to carefully delve its contents. Ability to process a message is related to factors internal to the receiver as well as to external factors. Among the internal factors are familiarity with the issues and cognitive ability and intelligence, factors that tend to increase capacity for information processing and preoccupation with other matters and lack of time, which tend to reduce the ability to elaborate.External factors that increase the ability to process include message repetition and clarity of presentation, while external distraction and use of complicated language can reduce processing ability. Some of the contextual factors studied by the Hovland group can come into play when internal or external factors lower the receivers ability to process the information presented in the message. Empirical Research When ability and motivation to process the message are low, receivers can use skirting(prenominal) cues (Petty and Cacioppo, 1986) or cognitive heuristics (Chaiken, 1980) to form their opinions.Chaiken assumed that receivers of a message, even if they are not very greatly involved, nevertheless are motivated to hold a correct view on the issue. Since, under conditions of low motivation a nd ability, receivers are either incapable or unwilling to deal with the merits of the advocated position, they look for contextual or peripheral cues that might provide a basis for forming an opinion. Perhaps the most powerful such cue is the communicators credibility, and it may be argued that this is the reason for the relatively consistent findings associated with communicator credibility.The heuristic strategy might in this case involve the following line of reasoning If this expert on the matter says so, it must be right. This heuristic appears quite reasonable in that it accepts the position advocated by a credible source, even if one has not carefully scrutinized the arguments presented. Receivers can also use the sources attractiveness, or factors related to the message such as the number of arguments it contains, as peripheral cues. Thus, a message coming from a iked source might be viewed as more trustworthy, and one that contains many arguments (even if specious) might be seen as more reliable than a message that contains few arguments. Note, however, that these rules of thumb are far less convincing as a rational basis for accepting or rejecting an advocated position, and it is perhaps for this reason that factors of this kind often fail to have strong or consistent effects on persuasion. In any event, relying on heuristics obviates the need for careful message processing, and at the same time provides a basis for adoption of a position on the issue.Recent empirical research tends to support this view of the peripheral travel plan to persuasion, although some complications have recently been noted (Johnson and Eagly, in press). Since excellent reviews are available elsewhere (Chaiken, 1987 Petty and Cacioppo, 1986), we limit our discussion here to an example concerning the effects of source characteristics. Recall that communicator attractiveness was one of the source characteristics studied in the Hovland paradigm that did not have a clear and consistent effect on persuasion.If treated as a peripheral cue used only when processing motivation or ability is low, more consistent findings tend to emerge. Attractiveness of the source has been varied by attributing the message to famous versus unknown individuals (Petty, Cacioppo, and Schumann, 1983) or to a likable versus an unlikable person (Chaiken, 1980). The investigators also manipulated the degree of involvement and found, as expected, that communicator attractiveness has a significantly greater effect on persuasion under low than under high involvement.Conclusions Work on the peripheral route to persuasion suggests that the source, message, channel, and receiver factors studied in the Hovland tradition can indeed influence the effectiveness of a message, but that this is likely to be the case only under conditions of low motivation or low ability to process the message. Such conditions can be obtained in the psychological research laboratory that ensures some degree of attention by a captive audience even if the receivers have little interest in the topic or lack the ability to process the information presented (Hovland, 1959).In more naturalistic field settings, receivers who Persuasive Communication Theory Page 9 lack the motivation or ability to process a message can usually leave the situation, while those who remain and are exposed to the message will tend to be sufficiently involved and able to process the information it contains. Persuasion by the peripheral route is clearly an inappropriate puzzle for many realistic situations, and it is often irrelevant even in the artificial context of the laboratory.REASONING AND PERSUASION Even when it works, there is something distinctly unsatisfactory in the demonstration of change via the peripheral route, because the change brought about does not represent persuasion as we usually think of it. We noted at the beginning that it is the process of reasoning, the evaluation of the merits of arguments in favor and opposed to the advocated position, that is at the heart of persuasive communication. Persuasion involves more than simply oing along with an expressed point of view because of the presence of some peripheral cue it requires that the advocated position be accepted only after careful scrutiny of the message and after application of whatever other information the receiver can bring to bear. Moreover, change produced by the peripheral route is generally of little practical significance. Petty and Cacioppo (1986) noted that peripheral attitude change tends to be shortlived, tends to be susceptible to counterpropaganda (McGuire, 1964), and tends to have little effect on actual behavior.Clearly then, from both a theoretical and a practical point of view it would be to our advantage to focus less on the context of persuasion and more on the substitution processes that occur when a person is exposed to a message. Persuasion by the Central Route In the remainder of this chapter we examine persuasion that occurs when the receiver of a message is sufficiently able and motivated to give at least some scrutiny to the contents of the communication and to evaluate the merits of the arguments it contains.This has been termed the central route to persuasion (Petty and Cacioppo, 1981) and the deliberations receivers perform are known as systematic information processing (Chaiken, 1980). Instead of asking what makes a given message more effective, we must now ask how to construct an effective message. That is, what arguments, when systematically processed via the central route, will have the superlative impact on the receivers attitudes and behavior? Before we can review what is known about this question, however, we must consider the role of the receiver in greater detail. The elaborateness Likelihood Model.The peripheral route to persuasion discussed earlier is one of two tracks a receiver can take in Petty and Cacioppos (1981, 1986) elaboration likelihood mode l (ELM). The second track is persuasion via the central route. harmonise to the ELM, central route persuasion depends on and is determined by the degree to which receivers elaborate on the information presented in the message. Briefly, during exposure to a persuasive communication, receivers are assumed to generate arguments of their own, either in support of the advocated position (pro arguments) or opposed to it (con arguments).These cognitive responses determine the direction and degree of change in attitudes and behavior. Increased motivation and ability to process the information in the message is, according to the model, associated with an increase in the number of cognitive responses (pro and con arguments) generated. To the extent that the number of arguments generated on the pro side exceeds the number of arguments on the con side, the receiver will change in the advocated direction. When elaboration leads to the production of more con than pro arguments, however, either n o change or a boomerang effect (change in the opposite direction) may occur.From the communicators point of view, therefore, motivation and ability to elaborate on message content is a two-edged sword. If, on balance, the thoughts generated by the receiver favor the advocated position, then the central route to persuasion works to the communicators advantage. On the other hand, if the receivers cognitive responses consist predominantly of counterarguments, then elaboration on message content can be quite detrimental to the communicators purpose.A number of studies, summarized in Petty and Cacioppo (1986), have examined the role of cognitive responses in the persuasion process. In these studies, cognitive responses are elicited Persuasive Communication Theory Page 10 in a free-response format following exposure to the message. The thoughts listed by the receivers are coded as either in favor or opposed to the advocated position, and the number of responses of each type is determined. Results, by and large, support the idea that the production of cognitive responses increases with motivation and ability to elaborate.Moreover, it is also found that changes in attitudes and behavior are consistent with the pattern of cognitive responses that are generated a balance of thoughts in favor of the advocated position tends to be associated with change in the desired direction. 2 Yielding and Impact. Consideration of cognitive responses generated by receivers in the course of exposure to the message is, however, not sufficient to account for observed changes in attitudes and behavior. For change to occur in the central mode, some of the receivers fundamental beliefs and values must undergo modification.Elaboration on the message may in fact lead to changes in cognitive structure, but evidence for the production of pro- or counter-arguments does not, in itself, assure that such changes have indeed taken place. Work on the elaboration likelihood model has focused primaril y on cognitive responses to the message and has not dealt directly with changes in cognitive structure. The ideas discussed below are based on other recent work concerning persuasive communication via the central route (Fishbein and Ajzen, 1975, 1981).According to Fishbein and Ajzen, a message can bring about changes in a receivers cognitive structure in one of two ways. First, in a process termed tractable, acceptance of arguments presented in the message can produce changes in corresponding beliefs held by the receiver. Consider, for example, a significant smoker who initially is not aware that cigarette smoking can adversely affect the health of her unborn baby. This woman is now exposed to a message containing an argument and supportive evidence that establish the link between smoking and adverse health effects on the fetus.To the extent that the argument is accepted, it produces yielding in the sense that the womans cognitive structure now contains a new belief that correspon ds directly to the argument in question. That is, she now believes, as stated in the message, that smoking may have ill effects on her unborn baby. Changes in a receivers primary beliefs, however, can extend far beyond the information directly contained in the message. Such changes that go beyond the information given are termed impact effects.To illustrate, the pregnant woman exposed to the message that smoking can have detrimental health effects on her fetus may infer that she would feel guilty if she did not stop smoking and that her doctor would pauperization her to quit, even though neither argument was explicit in the message. It is also possible, however, for her to draw inferences that would work against the aims of the communicator. For example, the woman may unexpectedly form the belief that quitting would be even worse than continued smoking because it would result in overeating.These impact effects can, of course, play a major role in the womans decision to quit or not to quit smoking. Evidence for the importance of considering yielding as well as impact effects can be found in a study on drinking reported in Ajzen and Fishbein (1980, pp. 218-242). Persuasive Argumentation The challenge facing a communicator trying to produce change via the central route is to create a message that will originate favorable responses, produce yielding to its arguments, and generate impact effects in accordance with the advocated change.Arguments contained in a message can be considered effective to the extent that they influence the receivers cognitive structure. The essential question, therefore, is what makes an argument effective. In light of the fact that rhetoricians have written about argumentation for over 2,000 years, it is surprising how little empirical knowledge is available about the relative effectiveness of different types of arguments (McGuire, 1985). An analysis of this problem reveals at least three important aspects of an arguments effectiveness n ovelty, strength, and relevance.Below we discuss each of these aspects in turn. Argument Novelty Persuasive Communication Theory Page 11 An argument contained in a message may well be accepted (i. e. , believed to be true), but if the receiver already held the belief in question before exposure to the message, no change in belief structure would result (Fishbein and Ajzen, 1981). To be effective therefore, an argument contained in a message must not be part of the receivers initial belief system. Some empirical evidence for this proposition can be found in research on group decision making (Vinokur and Burnstein, 1974).In the course of group discussions, members who offer novel arguments in support of a given decision alternative are found to be more influential than members who raise points that are well known to the rest of the group. Argument Strength Besides being novel, an argument must also be strong if it is to sway the receiver to adopt the advocated position. A strong argum ent is one that tends to produce agreement (positive thoughts) and does not encourage generation of many counterarguments (Petty and Cacioppo, 1986). Although it is not clear what makes a strong argument, its strength or weakness can be empirically established.Earlier in this chapter we gave an illustrative example of a persuasive argument taken from Petty and Cacioppos (1986) research program. The argument asserted that instituting a senior comprehensive examination would raise grade point averages (see p. xx). This argument and the associated evidence make a strong case for the advocated position. Compare this to the following argument, also designed to generate support for a comprehensive exam. The National Scholarship Achievement Board recently revealed the results of a study they conducted on the effectiveness of comprehensive exams at Duke University.One major finding was that student anxiety had increased by 31%. At comparable schools without the exam, anxiety increased by on ly 8%. The Board levelheaded that anxiety over the exams, or fear of failure, would motivate students to study more in their courses while they were taking them. It is likely that this increase in anxiety observed at Duke University would also be observed and be of benefit at other universities that adopt the exam policy (Petty and Cacioppo, 1986, p. 57). Although this argument is quite similar in structure to the strong argument presented earlier, it appears to present a much weaker case.In fact, this argument is typically found to generate many counterarguments. Clearly, in order to create an effective message, it is in the communicators interest to select strong arguments and avoid including arguments that tend to elicit negative thoughts about the advocated position. Argument Relevance Related to the question of an arguments strength is its relevance to the advocated position. An argument may be strong in the sense that it generates few counterarguments and many pro arguments, but if it addresses an issue that is not directly relevant to the advocated position, it may fail to produce the desired effect.This point is often not sufficiently appreciated. Suppose a communicator would like to convince students to attend an anti-apartheid demonstration in Washington, D. C. , and thus exposes the students to a persuasive message against apartheid in South Africa. Although the arguments contained in the message may be strong in the sense that they are believable and generate few counterarguments, the message may not be very effective as a means of inducing students to go to Washington.To make the message more relevant in terms of this goal, one would have to include strong arguments that deal more directly with the advantages of attending the planned demonstration. A relevant argument, then, is one that changes those primary beliefs of the receiver that are directly related to the target of the influence attempt, that is, to the attitude or behavior the communica tor wishes to affect. Different target variables are based on different primary beliefs, and an effective message must be betrothed to fit the target in question.General discussions of different target variables and their respective foundations of primary beliefs can be found in Fishbein and Ajzen (1975, 1981) and in Fishbein and Manfredo (Chapter xx, this volume). It is beyond the scope of this chapter to provide an in-depth review. Briefly, Fishbein and Ajzen distinguish Persuasive Communication Theory Page 12 among beliefs, attitudes, intentions, and behaviors as possible targets of a persuasive communication. To effect a change in any one of these target variables, the message arguments must be directed at the primary beliefs that provide the basis for the target in question.The first step in the construction of a message, therefore, requires a decision about the relevant primary beliefs, a process that cannot be left to intuition but must be guided by a model of the targets de terminants. Social psychologists have discussed a variety of approaches to understanding beliefs and attitudes and their relations to behavior, but perhaps the most popular models can be found within the framework of the theory of reasoned action (Fishbein and Ajzen, 1975 Ajzen and Fishbein, 1980) and its recent extension, the theory of planned behavior (Ajzen, 1985, 1988).The discussion below considers each target variable in turn however, a full understanding of the process is gained only by considering the relations among the different variables. Changing behavior. According to the theory of reasoned action, many behaviors of interest to social psychologists are under volitional control and, hence, are in an immediate sense determined by the intention to perform the behavior in question. A successful persuasive communication designed to change a certain behavior must therefore contain arguments that will bring about a change in the antecedent intention. The theory of planned beha vior oes beyond the question of intended action, taking into account the conjecture that the behavior of interest may not be completely under volitional control. To be successful, the message may have to provide information that will enable the receiver to gain volitional control and overcome potential obstacles to performance of the behavior. A review of evidence in support of these propositions can be found in Ajzen (1988). Changing intentions. The antecedents of behavioral intentions are, according to the theory of reasoned action, the persons attitude toward the behavior and his or her subjective norm.The attitude toward the behavior refers to the evaluation of the behavior as desirable or undesirable, and the subjective norm is the perceived social pressure to perform or not to perform the behavior in question. The theory of planned behavior again adds to this model a consideration of volitional control. When issues of control arise, intentions are influenced not only by attit udes and subjective norms but also by perceived behavioral control (Ajzen and Madden, 1986 Schifter and Ajzen, 1985).A persuasive communication designed to influence intentions (and thus also behavior) can be directed at one or more of the intentions three determinants attitudes, subjective norms, and perceived behavioral control. Changing attitudes. We arrive at the level of primary beliefs as we consider the determinants of a persons attitudes. According to the theory of reasoned action, attitudes are a function of salient beliefs about the attitude object (a person, group, institution, behavior or other event). Each salient belief links the object to an attribute or to an outcome in the case of a behavior.The attitude is determined by the strength of these beliefs and by the evaluations associated with the attributes (Fishbein, 1963 Ajzen and Fishbein, 1980). Beliefs about the attitude object that are salient prior to presentation of the message can be elicited in a free-response format. The message is then constructed such that it will either change some of the existing beliefs, either in their strength or their evaluations, or introduce new beliefs into the belief system. Changing beliefs. To change a specific belief on an issue, the persuasive communication has to address some of the information on which the belief is based.Several probabilistic models that link prior information to a given belief have been proposed and validated (McGuire, 1960b Wyer and Goldberg, 1970 for a review see Slovic, Fischhoff, and Lichtenstein, 1977). These models suggest that the information introduced by the persuasive communication must be information from which the belief in question can be probabilistically inferred. Conclusions The focus in recent years on the central route to persuasion holds great promise for a better understanding of persuasive communication.This route deals with the essence of the persuasion process, with changes in the fundamental beliefs on which t he receivers attitudes and actions are based. Although much remains to be done, social psychologists have gained considerable insight into some of the cognitive processes that are at work during and Persuasive Communication Theory Page 13 after exposure to a persuasive communication, and into the practical aspects of constructing an effective message. SUMMARY This chapter provided a brief historical perspective on persuasive communication theory in social psychology.No attempt was made to discuss all theoretical developments in detail as this task would require a book in itself. Instead, the focus was on a few dominant lines of theoretical development, from the beginnings of scientific research on persuasion in the 1940s to the present day. The work initiated by Hovland and his associates tended to view the receivers of a persuasive communication as passively learning the information presented and then changing their beliefs and attitudes accordingly. This view led to a concern with contextual factors, and practical(prenominal) neglect of the contents of the communication and its processing by the receiver.Few generalizable conclusions emerged from the research guided by this approach, and by the late 1960s the failure of the Hovland approach was widely acknowledged. kick upstairs was recorded when attention turned from contextual or peripheral factors to persuasion via the central route. Contextual factors were found to be important only under conditions of low involvement or low ability to process the message. It was discovered, however, as a general rule, that receivers of a message are far from passive, engaging in an active process of analyzing and elaborating on the information presented.It became clear that the effects of a persuasive communication could not be understood unless careful attention was given to these cognitive processes. Theoretical and empirical developments of the past two decades have enabled us to consider receivers cognitive respon ses during exposure to a message, yielding to the arguments contained in the message, and the messages impact on other beliefs not explicitly mentioned. These developments have also resulted in a much closer examination of the contents of persuasive communications, with an eye toward selecting arguments that will have the maximal effect on the target of the influence attempt.In this way, the theoretical developments of recent years have important implications for the practitioner who is concerned with constructing effective persuasive communications. Persuasive Communication Theory Page 14 REFERENCES Ajzen, I. 1985. From intentions to actions A theory of planned behavior. In J. Kuhl & J. Beckmann, eds. Action-control From cognition to behavior. Heidelberg Springer 11-39. Ajzen, I. 1988. Attitudes, personality, and behavior. Chicago Dorsey Press. Ajzen, I. , & Fishbein, M. 1980. Understanding attitudes and predicting social behavior. Englewood-Cliffs, NJ Prentice-Hall. Ajzen, I. & M adden, T. J. 1986. Prediction of purposeful behavior Attitudes, intentions, and perceived behavioral control. 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Jessor, eds. Contemporary approaches to cognition. Cambridge, MA Harvard University Press 41-69. Chaiken, S. 980. Heuristic versus systematic information processing and the use of source versus message cues in persuasion. Journal of Personality and Social Psychology, 39 752-766. Chaiken, S. 1987. The heuristic model of persuasion. In M. P. Zanna, J. M. Olson, & C. P. Herman, eds. Social Influence The Ontario Symposium, Vol. 5. Hillsdale, NJ Erlbaum 3-39. Cialdini, R. B. 1988. Influence lore and practice, 2nd Ed. Glenview, IL Scott, Foresman. Cook, T. D. , & Flay, B. R. 1978. The persistence of experimentally induced attitude change. In L. Berkowitz, ed. Advances in experimental social psychology, Vol. 1. New York Academic Press 1-57. Cronbach, L. J. 1975. Beyond the two disciplines of scientific psychology. American Psychologist, 30 116-127. Eagly, A. H. , & Himmelfarb, S. 197 4. Current trends in attitude theory and research. In S. Himmelfarb & E. H. Eagly, eds. 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Equal Opportunity for Financial Aid

Most post secondary institutions consider themselves to be equal opportunity establishments, although their monetary aid organisation does not always seem to agree. In leaving my native country for university I have personally gone through the difficulties of trying to get financial aid. If you ar an international student your only hopes of obtaining each aid are based on your athletic ability or your SAT scores. If we chose to come to the States to get a university upbringing, we should be case-hardened as equals and allowed to apply for all the same financial aid that the American students do.It is both student-athletes dream to come to an American university. Athletes from around the world try to obtain athletic scholarships in hopes of getting the training and recognition to be able to go professional. Unfortunately not e real athlete is able to obtain a full athletic scholarship, leaving the student to come up with the remainder. Not that we all deserve full scholarships, only if in order to qualify for an I-20 student indorse you must show proof of having 15,000 American dollars at your dispense. Once that amount is converted to Malayan silver that amount is nearly $60,000, significantly more than ny American student needs proof of.The Malaysian government does not agree with crowing of athletic scholarships, because they withhold any funding for student-athletes to leave to study in the United States. There is one source of financial aid for post secondary students from Malaysia, For students perusing internationally, called the Malaysia Student Assistance Program. This is a near impossible student loan to obtain, it is available to students whos parents either make enough money to send them anywhere they compulsion to go, or for students who could ot afford to go to university in Malaysia, consequently needing the athletic scholarships only offered in the United States.Being from a middle class family I, like numerous sweet(prenominal ) Malaysian student-athletes could not qualify for this loan because of my working class The other option for international students to obtain financial aid from the institution of bringing up would be from their SAT scores. The United States is the only country in which this standardized test is mandatory. In Malaysia the cost of taking this test is $100 American, which converts to approximately $ four hundred Malaysian, the cost of aking this test restricts most people from taking it numerous times as we are prompted to do.I could only afford to take the test once, therefore limiting my academic scholarship American students also have to opportunity to hold employment while in university. International students according to the I-20 student visa are unable to hold employment. We are not cash in ones chipsn social security numbers or citizenship status, although the majority of us will end up acquiring a green card and living in the United States by the time that we are done our university educational activitys. For the amount of money we are giving to the American deliverance one would think that they would be grateful and be willing to give back by helping to subsidize our education.We are pressure into bank loans, and personal loans to pay for our education. The thought of living in debt for the rest of by life trying to pay back seven years of post-secondary education is absolutely terrifying. As well as the thought of only being nineteen years old an already being in debt, because I am unable to hold a job or obtain any sort of financial aid because I am not an American The Malaysian government has a right to withhold money from its citizens for leaving the country, as well as the American government has a right to only give to American citizens.I am just unsure as to why either country would want to with hold money from any student from any country. In a time where education is so important to the future why would either country want to hold its yo uth back. We would not be aiding or taking away from either economy by studying in another country. We aid the American economy by continuing our education here, and then we return to our country f origin where we pursue summer and winter employment, where we still pay taxes.We are not helping solely our economy of our country of origin, but we are helping a global economy by becoming aware of not just our country, but also other countries. We remain sheltered if we stay in one place all our lives, we need to explore and see the world, and we can start by going from our seat country to another for post secondary education. The opportunity to study in another country does not come to everyone, but to those it does come to, it is a very difficult opportunity to pass up.If we are invited to this county to continue our education, why are we not treated as equals, both emotionally and financially. We, like the American students are just that, students. We do not come here because we do not want to study in our native countries, we come for the opportunity to experience new things, meet new people and become more educated, just like the American students. We do not come here to be judged or treated differently. We came to be treated like what we are, students, regardless of where we came from.

The business environment. PEST Analysis Essay

Logica is an innovative IT services organization which brings technologies, people and tune together. It has clients globally in various industries automotive, gas, oil and manufacturing.Its aim is to add value for clients via, for instance, trim down waste or improving productivity and efficiency.Political factors This refers to the various ways and to what degree does the government intervene in the business economy. Logica has to adhere to all government tax policy when the government increases the tax levied on a particular product in the business, price change should be done so as to ensure that the business does not run at a loss especially pertaining that certain product. The company forget hire personnel and the working terms and conditions must conform to the labor laws. The environmental law should be followed by the company and all the activities must be friendly to the environment. Trade restrictions and quotas are very eminent in most nations. The government g o out restrict trading of some commodities which are illegal n the country. The company must ensure that it trades with those products which are legal and have minimal negative effects. Political stability influences determines the operations of most businesses. A positive business growth is hastend by a politically stable environment while political instability discourages business growth.When the UK government increased university fees, (this affected the education sector) the faculty member providers had to address the challenges of generating income Logica noted that this educational landscape alterations could impact on the number of potential employees with the skills and competencies required.The increasing academic cost may restrict the social mobility of dexterous people hence may consider alternative routes to gaining experience and qualifications.Logica has reviewed its workforce planning to have effectively skilled workers now henceforth. To cater for the changes, it has introduced apprenticeships and enhanced its ammonium alum scheme thus provides the company with a new pool of talents especially IT and Computer Science specialists.About government initiatives on climate change and reducing emissions, Logica acted by being involved in the governments new Cycle Hire Scheme in London.Logicas role is central and focuses on the design and build of the simple-to-use payment system which is supported by a back office function (Palmer, & Hartley, 2006, p.18).Environmental factors The environment of logical has many elements which are paramount for thrive of the business. The customers of this business are key, and should have their needs met. The company should offer high quality products at reasonable fee. The creditors and suppliers of the business should be give on time for their supplies. Technology is very critical for all the services offered by the company. The company must acquire the latest technology so as to meet all the needs of the customers. The government is another environment which the company will operate in. it should follow all the government regulations set up for the industry. utmost but not least are the competitors. The company will face stiff competition from other firms. The company must come up with strategies that will make it have a competitive edge over the competitors. The company can be more competitive if it provides quality products, offer competitive prices, and respond positively to the needs of the creditors and suppliers (Cherunilam, 2010, p.38).Conclusion Effective knowledge of the aspects that affect the business operations will enable the business to make appropriate decisions that can facilitate its survival in the new environment without undergoing losses.ReferencesCherunilam, F. (2010). Business environment. Mumbai India Himalaya Pub. House.Palmer, A., & Hartley, B. (2006). The business environment (5th ed.). Maidenhead McGraw-Hill Education.Source document