What are the four stages of team development?

The four stages of team development, as identified by psychologist Bruce Tuckman, are Forming, Storming, Norming, and Performing. These stages describe the path that teams follow on their way to high performance. Initially, teams form and members cautiously explore the boundaries of acceptable group behavior. This is followed by a Storming phase where members start to push against those boundaries. During the Norming phase, the team finds its groove and establishes norms and standards. It’s in the Performing phase that the team finally starts to operate effectively and efficiently.

References: The answer is verified based on the widely recognized Tuckman’s model of team development, which is also reflected in the materials related to the Professional in Project Management (PPM) certification123.