As a leader, you know you must delegate many of the tasks for which you're ultimately responsible, if you're to be successful in meeting your goals. You know you can't do it all yourself. Typically, under-delegation is more common than over-delegation, and most leaders should give more away. 

That said, there are some things leaders should never delegate. Some tasks obviously shouldn't be delegated, such as the combination for the safe containing the bank's gold bullion, or the passwords to critical organizational computer files; however, sometimes it's less clear-cut, and it's hard to determine what to keep for yourself.

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