Time management science has proved that multitasking is not the best way to be productive. A crowded to-do list can be mentally draining. So, your next step is simple: narrow your focus to only one thing. But what do you do about the millions of other tasks calling for your attention? The trick is to keep using your to-do list as is, but with one important tweak. The Power of a “Do It Later” List “To-do lists tend to be long; success lists are short.” — Gary Keller, The One Thing You have a master to-do list filled with immediate tasks.