This document summarizes 12 practical business lessons from social psychology research. It discusses concepts like the foot-in-the-door phenomenon, where agreeing to a small request makes one more likely to agree to a larger request later. It also covers the door-in-the-face technique, where an unreasonable initial request makes a subsequent, reasonable request seem smaller by comparison. Finally, it discusses factors like primacy and recency effects in recall, cognitive dissonance in changing attitudes to match behaviors, and the importance of perceived expertise and trustworthiness when persuading others.