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In page Transactional analysis:

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Eric Berne presented Transactional Analysis to the world as a phenomenological approach, supplementing Freud's philosophical construct with observable data. His theory built on the science of Wilder Penfield and René Spitz along with the neo-psychoanalytic thought of people such as Paul Federn, Edoardo Weiss, and Erik Erikson. By moving to an interpersonal motivational theory, he placed it both in opposition to the psychoanalytic traditions of his day and within what would become the psychoanalytic traditions of the future.[citation needed] From Berne, transactional analysts have inherited a determination to create an accessible and user-friendly system, an understanding of script or life-plan, ego states, transactions, and a theory of groups.