If you keep track of all your assignments, appointments and responsibilities in your head, even if you never forget anything, you’re still using a lot of brain space that could otherwise be allocated elsewhere.
From this article by Ari Weinzweig, co-owner and founding partner of the Zingermann’s deli empire, an Ann Arbor based food services company with 500+ employees and 40 million dollars per year in sales:
“As Jim Munroe wrote in the comic book ‘Time Management for Anarchists' (and for a great little film clip of the same name): ‘When you develop a habit of writing down stuff, and [referring] to it often enough, you’ll find out an amazing thing: you can let it all go. You can forget about missing appointments, not getting stuff done, and have your brain back to think about creative, interesting stuff.’ I agree. I’ll take every little bit of brainpower I can free for fun and creative activities.”