Yes, "keep it all in your head" is a seriously terrible idea, unless your life and work are both amazingly simple and straightforward. You don't necessarily ne

Yes, "keep it all in your head" is a seriously terrible idea, unless your life and work are both amazingly simple and straightforward. You don't necessarily need an elaborate system. You don't need to follow GTD to the letter. But keeping stuff written down (in a reliable, visible place) is a huge mental relief.