Most suggestions for teaching problem solving are based on studies of how students solve problems in controlled settings. Although such suggestions at important, most students study problem solving, especially methods and techniques, in large – group classroom situations. Teachers exert substantial control over all aspects of the setting and intervene regularly in the interventions in the learning process may impact significantly and differentially on student learning. What is needed is careful scientific inquiry on the teacher’s role in the acquisition by students of problem – solving ability. While a logical argument has been made for advocating attention to the teacher, the rationale for this position is also supported by research.