I beleive that a part of leader's responsibility is to improve his or her team's effectiveness. I have not thought of it before but what is an effective team? What makes a team effective?
I found my answer in chapter 10 of 'Inspirational Leaders' by Ronald J Burke and Cary L. Cooper. In the book, team effectiveness consists of 2 components: team performance and team viability.
Performance relates to teams ability to successfully deliver an output. Where as the concept of viability is future oriented and includes continutity (maintaining core team membership), commitment (to shared goals), cohesion (unity between team members) and capability (developing competencies to achieve shared goals).
So to maximise effectiveness of a team, a leader must attend to both performance and viability of the team.