A common mistake is not delegating tasks because managers think that they can do it better themselves. Letting go can be a challenge, but a good manager knows when to accept that you cannot do everything yourself. This is very important when discussing your delegation skills. Some managers won't delegate tasks because they think this will take longer than just doing the work. In other words, they assume that it takes longer to teach someone else how to do it than do it themselves. Another reason why managers fail to delegate effectively is by being afraid of accountability.