Yes, this is a common mistake. As a person gets promotion and more responsibilities, the same person forget to learn to delegate.
Delegate, delegate, delegate. It is fundamental, and non-debatable.
You must delegate.
So here’s some management tips on delegation:
Harvard Business Review
NOVEMBRE 28, 2012
Why Aren’t You Delegating?
by Amy Gallo | 7:00 AM July 26, 2012