4 Instruct and Model Slavin (1987a) and Slavin (1994). It was written under funding from the Office of Educational Research and Improvement, U.S. Department of Education (No. OERI-R-117-R90002). The components of this model are as follows: 1. Quality of Instruction. The degree to which information or skills are presented so that students can easily learn them. Quality of instruction is largely a product of the quality of the curriculum and of the lesson presentation itself. 98