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In 'Games People Play', Dr. Eric Berne introduces his theory of transactional analysis as a way to interpret social interactions. He proposes that individuals switch between three ego states: the Parent, the Adult, and the Child. The book catalogs various 'mind games' that people engage in, which are patterned and predictable interactions that conceal hidden motivations and lead to specific outcomes. Berne argues that understanding these games can help individuals recognize and change dysfunctional patterns in their relationships. The book was a commercial success and has been influential in popularizing transactional analysis, despite receiving some academic criticism for its simplification of psychological concepts.

First published in 1936, 'How to Win Friends and Influence People' by Dale Carnegie is a timeless guide to improving interpersonal skills. The book is divided into four main sections: Six Ways to Make People Like You, Twelve Ways to Win People to Your Way of Thinking, and Nine Ways to Change People Without Giving Offense or Arousing Resentment. Carnegie's principles emphasize the importance of genuine interest in others, active listening, and avoiding criticism and argument. The book offers practical advice on how to build strong relationships, communicate effectively, and influence others by aligning their self-interest with yours. It has been a cornerstone of personal development and business success for generations.