“…Research in domains such as mathematics (Schoenfeld & Herrmann, 1982) and physics (Chi, Feltovich, & Glaser, 1981) indicates that experts focus on the deep structures of problems (e.g., principles and concepts that could be used to solve the problems) to decide whether or not two problems would be solved similarly. These findings suggest that when attempting to solve a problem, experts begin by considering what principle or principles apply most appropriately to the situation, and then decide on a strategy or procedure that will be used to instantiate that principle, or those principles (Larkin, 1981(Larkin, , 1983Larkin, McDermott, D. P. Simon, & H. A. Simon, 1980; D. P. Simon & H. A. Simon, 1978).…”