Four lists that can keep you on track. Regular readers know that I am a devotee of David Allen’s Getting Things Done system of productivity management. But, in truth, I don’t use his entire system, which if followed to the letter involves as many as 43 file folders and more lists than I can remember. Over the years I’ve reduced his system into four very simple lists that are easy to maintain and track.  Article: A Simplified Way to Use Getting Things Done