Peter Bregman reports on multitasking and its perils:
Doing several things at once is a trick we play on ourselves, thinking we're getting more done. In reality, our productivity goes down by as much as 40%. We don't actually multitask. We switch-task, rapidly shifting from one thing to another, interrupting ourselves unproductively, and losing time in the process.
You might think you're different, that you've done it so much you've become good at it. Practice makes perfect and all that.
But you'd be wrong. Research shows that heavy multitaskers are less competent at doing several things at once than light multitaskers. In other words, in contrast to almost everything else in your life, the more you multitask, the worse you are at it. Practice, in this case, works against you.
I decided to do an experiment. For one week I would do no multitasking and see what happened. What techniques would help? Could I sustain a focus on one thing at a time for that long?
For the most part, I succeeded. If I was on the phone, all I did was talk or listen on the phone. In a meeting I did nothing but focus on the meeting. Any interruptions — email, a knock on the door — I held off until I finished what I was working on.