Over the past ten or fifteen years the concept of multitasking had been touted as the way to be more productive. I rapidly discovered that multitasking was a great way to get remarkably poor results on more things in any given time period.

Research over the past couple of years has proven my experience to be the norm.

http://www.inc.com/jessica-stillman/this-is-your-brain-on-multitasking.html
Instead of trying to do several things at once—and often none of them well—Hammerness and Moore suggest what they call set shifting.

I've learned the lesson I was taught in seventh grade - focus, pay attention to what you're doing and don't try to do a dozen things at once. Do one thing, do it well and everyone is happy.
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AuthorDean Birinyi