Being Approachable

Being approachable is the most important quality in a manager.
The grass root concerns of the junior most employees and issues of middle management can be identifies faster and ascertained better if the seniormost manager is easy to talk to.
Generally, the concerns of a new joinee or a junior employee goes unheard in bureaucratic organizations. This leads to frustration in the lower and middle management levels.
A good manager should always encourage his reportees and non-reportees to walk in through his cabin door and talk to him.

However, being approachable should not be confused with fraternising with colleagues who report to you. If you are a manager, do not let your reportees get overtly friendly with you. Rest assured that most of the time they have some vested interest when they get too chummy with you. I have seen lots of my colleagues get their way with their managers by being friends with them. It is extremely unethical and unprofessional to fraternise with junior colleagues. Your reportees would respect you for maintaining a professional distance with them. Resist the temptation for that one drink after work. Trust me, you will be thankful in the long run.