In problem solving, the **problem space** is the set of all possible operations that can be performed in an attempt to reach a solution. The idea is credited, at least in one place, to A. Newell, who defined the *problem space principle* as “The rational activity in which people engage to solve a problem can be described in terms of (1) a set of states of knowledge, (2) operators for changing one state into another, (3) constraints on applying operators and (4) control knowledge for deciding which operator to apply next.”

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