Problem Solving

     Newell & Simon's Approach to Problem Solving
          Initial State
          Goal State
          Operators
          Constraints
          Problem Space
     
     Methods that show how people navigate problem space:
          Intermediate States
          Verbal protocols (think-aloud)
          Computer Simulation

     Problem Solving Strategies
          Algorithms
          Heuristics
               Hill climbing
               Means-Ends Analysis
                    Subgoals
               Analogy
               Working Backwards
                    (Especially for ill-structured problems)

     What leads to problem solving difficulties?
          Working memory limitations
          Failure to impose constraints or use subgoals 
          Failure to use analogy