Analyzed 124 doctoral dissertations related to TA and reported during the period 1963–21980 from universities primarily in the United States. Dissertations were categorized by topic (as indicated by the title), by geographic area, by type of degree granted, and by the writer's gender. Effectiveness of transactional analysis was the most frequent research topic, and “theory” the second most reported topic. “Ego states” were the most frequent theoretical concept considered.
