The tremendous power of team-based learning is derived from a single factor: the high level of cohesiveness that can be developed within student learning groups. In other words, the effectiveness of team-based learning as an instructional strategy is based on the fact that it nurtures the development of high levels of group cohesiveness which, in turn, results in a wide variety of other positive outcomes. It clearly takes a transformation process to evolve a small group into a powerful, cohesive learning team.