If you're congratulating yourself on doing half a dozen things at a time, don't be so hasty. A new study showed that only two tasks at a time can be productive. Anything more, and you're wasting all that brainpower by hampering your productivity, not increasing it. Article Do you do more than two things at once? I know I can have at least three things on my desk or my computer at any given time. In light of this, I'm going to seriously rethink that.