There's nothing abstruse or obscure about these six principles of persuasion. Indeed, they neatly codify our intuitive understanding of the ways people evaluate information and form decisions. As a result, the principles are easy for most people to grasp, even those with no formal education in psychology. But in the seminars and workshops I conduct, I have learned that two points bear repeated emphasis.
First, although the six principles and their applications can be discussed separately for the sake of clarity, they should be applied in combination to compound their impact. For instance, in discussing the importance of expertise, I suggested that managers use informal, social conversations to establish their credentials. But that conversation affords an opportunity to gain information as well as convey it. While you're showing your dinner companion that you have the skills and experience your business problem demands, you can also learn about your companion's background, likes, and dislikes - information that will help you locate genuine similarities and give sincere compliments. By letting your expertise surface and also establishing rapport, you double your persuasive power. And if you succeed in bringing your dinner partner on board, you may encourage other people to sign on as well, thanks to the persuasive power of social evidence.
The other point I wish to emphasize is that the rules of ethics apply to the science of social influence just as they do to any other technology. Not only is it ethically wrong to trick or trap others into assent, it's ill-advised in practical terms. Dishonest or high-pressure tactics work only in the short run, if at all. Their long-term effects are malignant, especially within an organization, which can't function properly without a bedrock level of trust and cooperation.
That point is made vividly in the following account, which a department head for a large textile manufacturer related at a training workshop I conducted. She described a vice president in her company who wrung public commitments from department heads in a highly manipulative manner. Instead of giving his subordinates time to talk or think through his proposals carefully, he would approach them individually at the busiest moment of their workday and describe the benefits of his plan in exhaustive, patience-straining detail. Then he would move in for the kill. "It's very important for me to see you as being on my team on this," he would say. "Can I count on your support?" Intimidated, frazzled, eager to chase the man from their offices so they could get back to work, the department heads would invariably go along with his request. But because the commitments never felt voluntary, the department heads never followed through, and as a result the vice president's initiatives all blew up or petered out.
This story had a deep impact on the other participants in the workshop. Some gulped in shock as they recognized their own manipulative behavior. But what stopped everyone cold was the expression on the department head's face as she recounted the damaging collapse of her superior's proposals. She was smiling.
Nothing I could say would more effectively make the point that the deceptive or coercive use of the principles of social influence is ethically wrong and pragmatically wrongheaded. Yet the same principles, if applied appropriately, can steer decisions correctly. Legitimate expertise, genuine obligations, authentic similarities, real social proof, exclusive news, and freely made commitments can produce choices that are likely to benefit both parties. And any approach that works to everyone's mutual benefit is good business, don't you think? Of course, I don't want to press you into it, but, if you agree, I would love it if you could just jot me a memo to that effect.