I'd bet my bottom dollar that every one of us is multitasking as we speak - checking emails, working on projects, thinking about what's still to be done, what tomorrow holds etc. The one time you shouldn't though is when you're trying to learn something apparently. I read this excellent article about how we shouldn't multitask when we're trying to learn something because our brain literally doesn't absorb information as well as it could when we don't. It stores it in different areas of the brain depending on our focus. I found this well researched article fascinating and hope you like it: The Myth of Multitasking The question is, how do we fit it all in if we don't?