Two commonly accepted theories of group development are the Tuckman model (Tuckman & Jensen, 1977) and the Punctuated-Equilibrium model (Gersick, 1988). Critiques of both are that they assume linear development and that they fail to account for outside influences. In contrast, Tubbs (2004) suggests that group development should be viewed from a systems perspective. This paper proposes a model that could assist the educator of group development theories in integrating Tuckman, PEM, and Tubbs's models. (Contains 2 figures.)