Jason Fried claims that the most effective way to improve productivity is to eliminate interruptions and prioritize long, uninterrupted blocks of work time for employees.

“I think you need contiguous amounts blocks of time to do great creative work you can't do it 15 minutes at a time then check your phone then to get twenty minutes and there's a conference called and you're pulled into a meeting and before you know it's the end of the day you've got nothing done”