Answer to Question 1
People seem to make three main kinds of errors when trying to solve well-structured problems:
1 . Inadvertently moving backward: They revert to a state that is further from the end goal.
2 . Making illegal moves: They make an illegal movethat is, a move that is not permitted according to the terms of the problem.
3 . Not realizing the nature of the next legal move: They become stuckthey do not know what to do next, given the current stage of the problem.
Answer to Question 2
Sometimes, two problems are isomorphicthat is, their formal structure is the same, and only their content differs. Determining the underlying structural isomorphism of problems is often difficult. It is also difficult to apply problem-solving strategies from one problem to another. Problem solvers are particularly unlikely to detect isomorphisms when two problems are similar but not identical in structure. Furthermore, when the con- tent or the surface characteristics of the problems differ sharply, detecting the isomorphism of the structure of problems is harder.
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