The study examined effects of a combined teacher-parent behavior management program focusing on inappropriate behaviors in the school and homes of five preschool children with developmental and/or language delays, behavior disorders, and/or multiple handicaps. A special education teacher/trainer collaborated with parents to select target behaviors for the children. Training in selected behavior management strategies was conducted by the teacher in home consultations. Behavior management programs were introduced simultaneously in homes and classrooms using an AB design with across subject replication. The results suggest that parent/teacher collaboration in implementing behavior change programs can substantially decrease occurrence of problem behavior in both home and school settings. (PB)