Influence : Science and Practice by Robert B. Cialdini (1997, Trade Paperback). Narrative writing is combined with scholarly ideas in this examination of the psychology of compliance (ie uncovering which factors cause one person to say yes to another's request). By combining evidence from two relevant, but very different arenas - the realm of controlled research and the working world of influence professionals - this book looks at this issue in terms of six basic principles of psychology (one to a chapter). These principles direct human behaviour, and are therefore extremely powerful: reciprocation, consistency, social validation, liking, authority and scarcity. This text is a supplement for courses in introductor psychology, social psychology, management, sales, marketing and persuasion.