Something as simple as a to-do list can have all manner of
  critical thinking involved. "Do I need to do this? Why do I
  think I need to do this? How does doing this relate to other
  things I need to do? Can someone else do it for me? What's the
  most important reason I need to do this?"
  etc. It's effective.

  The part missing from Critical Thinking tasks is Time. Critical
  Thinking is Timeless - it does not require a When. It's a void
  in Critical Thinking methods.

  "When do I need to do this? Can it wait until later? How long
  can I wait to do this? If I feel as if I must do it now, why?
  Who needs it done now? Are the time constraints valid? Can I
  modify the Time constraints?"