Related:

• The most vital dimension on any plan or drawing stands the greatest chance of being omitted.
• Any error in any calculation will be in the direction of most harm.
  -- The RPCISPE's Second Universal Law...
• That device requiring the most service will be least accessable.
  -- The RPCISPE's Fifteenth Universal Law...
• In any calculation, any error which can creep in will do so. -- The RPCISPE's First Universal Law
• Interchangeable parts won't. -- The RPCISPE's Eleventh Universal Law
• In any formula, constants (especially those obtained from handbooks) are to be treated as variables.
  -- The RPCISPE's Third Universal Law...
• Vital papers will demonstrate their vitality by spontaneously moving from where you left them to where you can't find them.
  -- Fifth Law of Office Murphology...
• Actual service conditions cannot be met in the laboratory. -- The RPCISPE's Fourth Universal Law
• Operation instructions shipped with the unit will be discarded by Receiving.
  -- The RPCISPE's Fourteenth Universal Law...