In his original model of group development in 1965, psychologist Bruce Tuckman named the stages "forming, storming, norming, and performing." Twelve years later, Tuckman created a fifth stage called "adjourning."

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Bruce Tuckman initially introduced the four stages of group development in 1965 and later added a fifth stage, "adjourning," in 1977.

In His Original Model of Group Development in 1965, Psychologist