This document discusses the principles of transactional analysis (TA). It describes TA as studying social transactions between people and using it to better understand behavior, especially in relationships. TA focuses on three ego states (parent, adult, child), transactions between people, and "strokes" or feedback. It is used in management training to improve communication. The document outlines the key concepts of TA including the different ego states, complementary and crossed transactions, and the Johari window model of self-awareness.