Guidelines -- Assess Objectively
5. It frequently occurs that everything checks out and is
found to be OK … but the bug still persists
   Don’t become so frustrated that you stop thinking
logically.  Rather, evaluate your progress objectively:
how are you doing?
o Are you making a wrong assumption?
o Do you misunderstand what the data means?
o Have you made a wrong deduction?
Remember … it’s a mystery and you are Jane
Marple or Hercule Poirot … using those “gray
cells” you can find the culprit