Transactional analysis (TA) is a theory developed in the 1950s that offers a model of personality and dynamics of self and its relationship to others. TA analyzes interpersonal interactions called "transactions" between three ego states - parent, adult, and child. It also describes four life positions that shape one's view of self and others. TA can be used to develop positive thinking, improve interpersonal effectiveness, enhance motivation, and aid in organization development by maintaining healthy ego state interactions and transactions.