It’s very common for manager to think they’re supposed to 
  have all the solutions for any problem that arises on their watch. That kind 
  of thinking can get you into deep trouble. For one thing, it sets you up to 
  fail because no one has all the answers. For another, it undermines your 
  credibility because everybody knows that no one has all the answers. It also 
  isolates you from your people. A big pitfall of managers at all levels is the 
  notion that they have to be perfect. I’ve known supervisors that couldn’t hold 
  a meeting because they were afraid that someone would ask a question they 
  couldn’t answer. I’ve known CEOs who couldn’t leave their office unless their 
  ties were perfect and every hair on their head was in place. Managers like 
  that wind up hating their jobs. They will soon believe they have to live up to 
  an image, to be an idol, to be a representative of a position.
  At the same time, they’re failing as managers because they 
  aren’t doing what every good manager has to do, build confidence in other 
  people. To do that, you have to show people that you’re human, you’re not God, 
  you don’t have all the answers, you make mistakes. You send the wrong message 
  if you try and be perfect, if you always want to solve the problems yourself. 
  You’re much better off sharing problems, using the people you work with to 
  come up with solutions.
  Aside from sharing your management problems, they teach you 
  the importance of managing with the downside in mind. Because, failure is part 
  of the process. You can’t succeed if you if you don’t fail sometimes. But if 
  you’re not prepared for failure, it will take you by surprise and knock you 
  for a loop. Therefore, you have to manage with the understanding that things 
  may not work out according to plan. You have to have your strategy backed up.
  The secret is making contingency planning a habit of mind. 
  It was a habit I developed as I moved up the ladder and found the problems 
  kept getting harder. I would teach my people everything I knew, and it 
  wouldn’t be enough, so together we would come up with one more trick. I 
  learned that I could respond better if I already had a fallback position, an 
  idea about what to do if the unexpected happened. Maybe it was just a plan to 
  call certain people together I could share the problem with. But at least I 
  wouldn’t be shocked, I wouldn’t freeze, I could spring into action.
  This was critical because everybody, my staff the board of 
  directors, was depending on us. When you have the responsibility to take care 
  of other people, you do whatever it takes to get the job done.