If you were to research every book or article written on the subject of effective leadership traits, you will eventually find they all conclude that one trait is essential: effective communication. A great leader knows how to communicate. And that is not to say that she writes well or speaks eloquently. True effective communication requires the ability to understand your audience's background and how it will interpret what you are communicating.
Communication is also a two-way street. A good leader will make listening to new ideas, concerns and issues a priority. Establishing an open-door policy and being approachable provides the most effective way to keep lines of communication free flowing and genuine. A good leader knows how to communicate his vision in a way that all team members clearly understand the direction, as well as their function within the team.