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  Measures of Difficulty
  
  Books advertise puzzles of varying levels of difficulty
    but provide no objective measures.

  Here are three measures for a deducing program:

    Iteration count 1:  number of times through
      the major loop in the program.

    Iteration count 2:  number of times the user
      is called on to assist the program.

    The number of guesses required to solve a puzzle.
    
  Here is one measure for a searching program:
  
    With a search and backtrack program a reasonable measure
      of difficulty is the number of branches on the search tree.
  

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