This document provides an overview of Transactional Analysis theory. It discusses the three ego states that make up an individual's personality according to this theory: the Parent ego state, Adult ego state, and Child ego state. The Parent ego state contains nurturing and critical behaviors learned from caregivers. The Adult ego state objectively processes information. The Child ego state involves spontaneous and adaptive behaviors from childhood. The document also describes complementary, crossed, and ulterior transaction types and defines strokes as units of human recognition.