The Mental Health Prevention/Intervention Project (MHP/IP) was designed to provide and assess comprehensive and effective mental health services to Head Start children, parents, families, and staff. Sponsored by the Latin American Civic Association (LACA) in Los Angeles, the 14-month intervention was implemented and assessed on three levels: (1) staff training and consultation; (2) parent education and involvement; and (3) in-house mental health treatment services, including short-term psychotherapy. A comprehensive needs assessment survey was conducted to provide a profile of the Head Start families served by LACA. Out of 960 children and families in the program, 845 survey questionnaires were completed and returned. A follow-up questionnaire was completed later in the year on a sample of 220 families. Head Start teachers were trained to promote children's emotional development and social competence and to identify problems with the potential for long-range damaging effects. Bilingual parent education provided training to support parents as the primary educators of their children and to increase parent involvement in LACA Head Start activities. A team approach to mental health treatment encouraged parent involvement and teacher participation. Concluding remarks suggest that the success of the MHP/IP model warrants replication in other Head Start settings. Related materials are appended, including instruments and samples of treatment case summaries. (RH)