If you make your ‘to-do’ list very long, you’re potentially creating a situation from which you’ll never climb out, because there will always be more things to do coming in.
On the other hand, if you make your ‘to-do’ list very short, you’re potentially creating a very productive situation – one in which you are forcing yourself, by way of using ‘a beautiful constraint‘, to choose what matters the most.
Matt Fried 