Systems-centered† therapy and training (SCT) is a theory-based systems approach that introduces the method of functional subgrouping that enables groups to more easily integrate differences in the service of group development and transformation. Functional subgrouping interrupts the endemic group dynamic pattern of scapegoating differences and enacting repetition compulsion roles fueled by group phases that fixates group development. It also simultaneously develops the capacity of the group for Porges‘ (2011) social engagement which supports group members learning to enhance and utilize their social brain functioning and resources.