A guide for new team development, new unit development, and new staff development. As a group of individuals become a team, the group moves through a predictable set of dynamics or developmental stages. Teams become successful and effective when they move through these stages step by step. Psychologist Bruce Tuckman came up with the phrase "forming, storming, norming, and performing" in his 1965 paper, "Developmental Sequence in Small Groups." Bruce Tuckman has postulated five progressive stages of development: