Whether you are forming a new agile team or mixing people in an already existing team you start somewhat afresh. In an existing team the balance and group dynamics changes, in a new team people are experiencing each other for the first time and checking what the boundaries are. I don’t want to get into details of what can possibly happen — it’s best if you dig into works of Bruce Tuckman and his four-stage model or Gustave Le Bon’s “The Crowd”. The former indicated that the team goes through the stages of Forming - Storming - Norming - Performing. I would like to concentrate on the very initial stage of “Forming” the team in the first weeks of it’s existence.