Related:

• Not until a program has been in production for at least six months will the most harmful error then be discovered.
• 1) If a test installation functions perfectly, all subsequent systems will malfunction.
  2) Not until a program has been in production for at least six months will the most harmful error be discovered....
• Variables won't. -- Troutman's Programming Postulate #5
• Constants aren't. -- Troutman's Programming Postulate #4
• Troutman's Fifth Programming Postulate: If the input editor has been designed to reject all bad input, an ingenious idiot will discover a method to get bad data past it.
• Laws of Computer Programming: 1. Any given program, when running, is obsolete.
  2. Any given program costs more and takes longer....
• A Batch Stream that can not be arranged in improper order will be.
  -- Troutman's Programming Postulate #3...
• 1) Any given program, when running, is obsolete. (2) Any given program costs more and takes longer.
  (3) If a program is useful, it will have to be changed....
• Laws of Computer Programming (1) Any given program, when running, is obsolete.
  (2) Any given program costs more and takes longer....