Transactional analysis (TA) was formulated by Eric Berne in the 1960s as a model of psychotherapy and personality theory. It views personality as comprising three ego states - parent, adult, and child. The goal of TA therapy is to help clients transform themselves by identifying distorted ego states and restoring healthy communication patterns. Key concepts include transactions between ego states, games people play, and life scripts formed in childhood. TA aims to increase self-awareness and autonomy through techniques like treatment contracting, interrogation, and script analysis.