I was given the following question...

explain the principals of delegation of authority, including why it is often inadequately performed.

why it is inadequately performed so far i have: People often fear that if they select the wrong person to delegate a task to...they will have to take the responsibility.
how would i answer the first part?

http://www.managementstudyguide.com/delegation_of_authority.htm

Some people like to keep control of most things. They believe that their way is the only way and that others won't do the job "right."