This set of transactional analysis core concepts was developed in 1999 by the members of the task force on transactional analysis core concepts, which later became an ITAA development committee task force. The group was chaired by Claude Steiner and included Leonard Campos (USA), Pearl Drego (India), Vann Joines (USA), Susanna Ligabue (Italy), Gloria Noriega (Mexico), Denton Roberts (USA), and Emilio Said (Mexico).
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