Using the developmental line from play to work, Anna Freud discusses the synthesis between drive and ego factors in healthy play. Further, she examines the synthesis function as it pertains to ego, id, and the environment in relation to the developmental lines toward work, peer relations, food intake, and independence and motility. Finally, she equates the psychopathology of neurosis as compromise to the ego's synthetic function and its use of compromise in normal development; developmental disharmonies are similar to the conflict seen in the more severe disturbances of childhood.