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The Science Of Persuasion

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Cialdini, Robert B.

Scientific American; Feb2001, Vol. 284 Issue 2, p76, 6p

THE SCIENCE OF PERSUASION

Salespeople, politicians, friends and family all have a stake in getting you to agree to their requests. Social psychology has determined the basic principles that govern getting to "yes"

Hello there.

I hope you've enjoyed the magazine so far. Now I'd like to let you in on something of great importance to you personally. Have you ever been tricked into saying yes? Ever felt trapped into buying something you didn't really want or contributing to some suspicious-sounding cause? And have you ever wished you understood why you acted in this way so that you could withstand these' clever ploys in the future?

Yes? Then clearly this article is just right for you. It contains valuable information on the most powerful psychological pressures that get you to say yes to requests. And it's chock-full of NEW, IMPROVED research showing exactly how and why these techniques work. So don't delay, just settle in and get the information that, after all, you've already agreed you want.

The scientific study of the process of social influence has been under way for well over half a century, beginning in earnest with the propaganda, public information and persuasion programs of World War II. Since that time, numerous social scientists have investigated the ways in which one individual can influence another's attitudes and actions. For the past 30 years, I have participated in that endeavor, concentrating primarily on the major factors that bring about a specific form of behavior change-compliance with a request. Six basic tendencies of human behavior come into play in generating a positive response: reciprocation, consistency, social validation, liking, authority and scarcity. As these six tendencies help to govern our business dealings, our societal involvements and our personal relationships, knowledge of the rules of persuasion can truly be thought of as empowerment.

Reciprocation

When the Disabled American Veterans organization mails out requests for contributions, the appeal succeeds only about 18 percent of the time. But when the mailing includes a set of free personalized address labels, the success rate almost doubles, to 35 percent. To understand the effect of the unsolicited gift, we must recognize the reach and power of an essential rule of human conduct: the code of reciprocity.

All societies subscribe to a norm that obligates individuals to repay in kind what they have received. Evolutionary selection pressure has probably entrenched the behavior in social animals such as ourselves. The demands of reciprocity begin to explain the boost in donations to the veterans group. Receiving a gift--unsolicited and perhaps even unwanted--convinced significant numbers of potential donors to return the favor.

Charitable organizations are far from alone in taking this approach: food stores offer free samples, exterminators offer free in-home inspections, health clubs offer free workouts. Customers are thus exposed to the product or service, but they are also indebted. Consumers are not the only ones who fall under the sway of reciprocity. Pharmaceutical companies spend millions of dollars every year to support medical researchers and to provide gifts to individual physicians--activities that may subtly influence researchers' findings and physicians' recommendations. A 1998 study in the New England Journal of Medicine found that only 37 percent of researchers who published conclusions critical of the safety of calcium channel blockers had received prior drug company support. Among researchers whose conclusions supported the drugs' safety, however, the number of those who had received free trips, research funding or employment skyrocketed--to 100 percent.

Reciprocity includes more than gifts and favors; it also applies to concessions that people make to one another. For example, assume that you reject my large request, and I then make a concession to you by retreating to a smaller request. You may very well then reciprocate with a concession of your own: agreement with my lesser request. In the mid-1970s my colleagues and I conducted an experiment that clearly illustrates the dynamics of reciprocal concessions. We stopped a random sample of passersby on public walkways and asked if they would volunteer to chaperone juvenile detention center inmates on a day trip to the zoo. As expected, very few complied, only 17 percent.

For another random sample of passersby, however, we began with an even larger request: to serve as an unpaid counselor at the center for two hours per week for the next two years. Everyone in this second sampling rejected the extreme appeal. At that point we offered them a concession. "If you can't do that," we asked, "would you chaperone a group of juvenile detention center inmates on a day trip to the zoo?" Our concession powerfully stimulated return concessions. The compliance rate nearly tripled, to 50 percent, compared with the straightforward zoo-trip request.

Consistency

In 1998 Gordon Sinclair, the owner of a well-known Chicago restaurant, was struggling with a problem that afflicts all restaurateurs. Patrons frequently reserve a table but, without notice, fail to appear. Sinclair solved the problem by asking his receptionist to change two words of what she said to callers requesting reservations. The change dropped his no-call, no-show rate from 30 to 10 percent immediately.

The two words were effective because they commissioned the force of another potent human motivation: the desire to be, and to appear, consistent. The receptionist merely modified her request from "Please call if you have to change your plans" to "Will you please call if you have to change your plans?" At that point, she politely paused and waited for a response. The wait was pivotal because it induced customers to fill the pause with a public commitment. And public commitments, even seemingly minor ones, direct future action.

In another example, Joseph Schwarzwald of Bar-Ilan University in Israel and his co-workers nearly doubled monetary contributions for the handicapped in certain neighborhoods. The key factor: two weeks before asking for contributions, they got residents to sign a petition supporting the handicapped, thus making a public commitment to that same cause.

Social Validation

On a wintry morning in the late 1960s, a man stopped on a busy New York City sidewalk and gazed skyward

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