During the Progressive Era, the child guidance movement began as part of the Commonwealth Fund's for the Prevention of Juvenile Delinquency. During its years as a Commonwealth Fund project (1922-1945) the movement grew from a community effort for the prevention of mental illness to a field of specialty practice in psychiatry, psychology, and social work. Employing the newly accessible archives of the Commonwealth Fund, Margo Horn presents the complex history of the child guidance movement in relation to the mental health professions, philanthropic foundations, and the American family.Originally focused on the identification of the problem child, the establishment of child guidance clinics, and programs to promote community mental health, the movement gradually shifted its goals toward the training of child guidance professionals and the monitoring of growth and treatment by the clinics. The idealistic concern over community mental health became a concern over professional standards and status with the fields of psychiatry, psychology, and social work vying for prominence. Within the context of this transition, Horn examines the ways in which the family and children increasingly came under the scrutiny of experts. Margo Horn directs the Innovative Academic Courses Program and teaches History at Stanford University.