A data based method for mainstreaming involving 120 elementary students (grades 1 through 5) enrolled in a resource room was utilized. Ss were monitored to find the percent of assignments they were completing in their regular classroom, and to determine the feasibility of using this data base to identify students who were not achieving, and to determine the effectiveness of an intervention procedure combining self-instruction with extrinsic reinforcement. Data was collected in three measurement conditions (baseline, intervention, and end of year check) for 12 students identified as needing extra help as an evaluation program. Six of the Ss exceeded the level of assignment completion necessary. (Author/BD)