The Pendleton Project is an interagency/interdisciplinary program providing outclient, day treatment, and residential services to 6- through 12-year-old children who exhibit serious and persistent behavior problems. The objective of the project is to implement a comprehensive intervention program for the child by means of both direct treatment and referral to other appropriate community resources. Outclient services focus on counseling parents and teachers in alternative methods of child management. Intervention effectiveness is monitored by means of behavioral data. After 3 1/2 years of operation, treatment success is 76% at termination of active intervention services with 58% of the children behaving acceptably at 12-month followup. The treatment effectiveness data, in combination with relatively short treatment time required, strongly support the use of intensive, closely monitored intervention procedures with this population. Interagency participation in the project appears to have significant impact on treatment effectiveness. The interagency model does create problems in financial management and personnel matters and requires assertive public relations efforts for community acceptance, but treatment effectiveness data supports continuation of the model. (Among appendixes are a table of referral statistics, a diagram of the model, and information on termination and followup.) (Author/SBH)