Things are never going according to plan in chaotic environments (which is most real-life environments).

But, planning forces you:

  • to know your SWOT (strength, weakness, opportunities, and threats)
  • to know what your values and principles are
  • to see possible common exceptions
  • to make contingency plans for these exceptions
  • to prepare for the worst

Hope for the best, prepare for the worst, expect the most likely.