Over the course of my coaching life, I have learnt many valuable lessons that apply not only to coaching. Two of these lessons stand out.
The most important thing that a coach (or businessman, or leader of any kind) must possess is a vision. The coach must know exactly the type of volleyball he wants to play. Exactly how to play that volleyball is a secondary concern. There are many ways to get to the right point and it is impossible to predict exactly which way will be best. Indeed sometimes you will make huge detours as events take a life of their own, but if you have the vision, you will always be able to get back on track.
The most important thing a coach must understand is that it is impossible to control people. You can, and must, influence them positively in order to achieve your, and their, goals. But you most you can do is guide them in the right direction. Remind them constantly of your vision, of why it is important and show them how they can get there. And remember that sometimes, if you pay attention you can actually get somewhere even better than where you imagined.
But don’t take my word for it. Listen to what Steve Kerr has to say.