We describe some of Merl's more subtle contributions that extended beyond his own prodigious scholarly record, his high-quality teaching, and his mentoring of students. The context of our remarks on Programmatic R&D focuses on his contribution to the University of California, Los Angeles, Department of Education. Merl was the first director of…

Contends that most teachers do not effectively identify and correct student misconceptions and mislearning. Reviews models to identify student mislearning and ways to help students correct the mislearning. Describes a staff development program in which mentor teachers received training using these instructional strategies. (CFR)