In knowledge work, when you agree to a new commitment, be it a minor task or a large project, it brings with it a certain amount of ongoing administrative overhead: back-and-forth email threads needed to gather information, for example, or meetings scheduled to synchronize with your collaborators. This overhead tax activates as soon as you take on a new responsibility. As your to- do list grows, so does the total amount of overhead tax you’re paying. Because the number of hours in the day is fixed, these administrative chores will take more and more time away from your core work, slowing down the rate at which these objectives are accomplished.