The particular skill that allows you to talk your way out of a murder rap, or convince your professor to move you from the morning to the afternoon section, is what the psychologist Robert Sternberg calls "practical intelligence." To Sternberg, practical intelligence includes things like "knowing what to say to whom, knowing when to say it, and knowing how to say it for for maximum effect.
Malcolm GladwellWhat happens when two people talk? That is really the basic question here, because, that's the basic context in which all persuasion takes place.
Malcolm Gladwell