The most effective manner I ever used was some variation on the "due on or befor...

		judys on April 25, 2012 \| parent \| context \| favorite \| on: How to Set Deadlines for Your Students The most effective manner I ever used was some variation on the "due on or before but not after" deadline. This could be used with extra points (reward) if turned in anytime in the "before" range and no reward (but acceptance) if turned in "on".