Forming, Storming, Norming, and PerformingB.W. Tuckman first proposed his theory on the stages of team development in 1965. It has been modified numerous times since by many other researchers (and there are many other similar models) but in general, the four stages (common to most teams, sequential and happen in order) are Forming, Storming, Norming, and Performing. By MindTools.com