Tuckman's Team Development Model

Team-building activities are one of the Tools and Techniques of Develop Project Team process in Human Resource Management. According to Bruce Tuckman's theory, teams go through five stages of development - Forming, Storming, Norming, Performing, Adjourning. The PMBOK Guide, 4th edition, gives a brief description of these stages on page 233. Here's an excellent article that explains these stages in detail:

Tuckman's Team Development Model