This booklet describes the Washington, D.C., Teacher Aide Program (TAP), a project designed to develop methods of training nonprofessionals to work with teachers in schools attended by children of low-income families. Chapters include: (1) a descriptive overview of the program with notes on its background and the staff; (2) discussion of the recruitment and selection, background and personal qualifications, assignments, and specific duties of the 80 teacher aides and four field coordinators; (3) description of the four-phase organization and the content (in language arts, art, music, dramatics, recreation, mathematics, science, classroom skills, and accident prevention and first aid) of the training program conducted by the Washington School of Psychiatry; (4) discussion of the program's focus on the aide's role as a second adult in the classroom through a preservice training course in child development and behavior, supplemented by inservice seminars and conferences, and a continuous program of training in interpersonal relations for development of self-awareness and of effective relationships with parents and teachers; (5) description of the evaluation procedures employed and the results of the evaluation; and (6) conclusions regarding the program's effectiveness. Appended are the program proposal, questionnaires and tabulations, reports of inservice seminars, and the advisory committee's job description of the teacher aide. (JS)