The paper describes combined public education and community mental health in a preschool educational day treatment program for seriously emotionally disturbed children. The Developmental Therapy model on which the Tacoma, Washington, program is based is described as using five normal developmental stages to facilitate treatment which stresses the role of the curriculum, provides for ongoing evaluation, and defines the staff functions of both public school and mental health agencies. Responsibilities of the children's mental health specialist (support teacher), educator, psychologist, team coordinator, psychiatrist, communication disorder specialist, occupational therapist, and community health nurse are listed. The funding base provides for treatment for children who qualify for public assistance and charges other children on a sliding fee scale. The combined, yet separately identifiable education and mental health goals, make up the individualized educational/treatment program. Also considered is the 7 step referral and assessment process and services to families (including biweekly home visits and parent participation in the classroom). (DB)