Over the course of the last twenty years I've been part of and put together dozens of teams. Over the last few years I've been putting together teams more often. I've found that it is important to recognize that teams evolve. They take on an identity. They have a culture. At the beginning of a project they are a collection of individuals, at the end of a project the team is far more than the sum of its people - in ways that are difficult to predict. At its essence, teams are organic entities which are grown as opposed to assembled or built.