The field of group theory and its application in the field of psychotherapy has burgeoned over the last 50 years. Currently, group methods are used under several theoretical umbrellas. The goals of group therapy are varied from overall personality reorganization to symptom‐focused work. Specific populations are sometimes treated in homogeneous groups and inpatient units are evermore dependent on group interventions. The psychological economy of working in groups matches the fiscal economy, which is such a challenge at the turn of the twenty‐first century. This chapter explores the broad spectrum. Beginning with a brief history of group psychotherapy and its evolution, we then examine the theorists whose work has been expressed in group practice. These include the psychodynamic theorists, nonanalytic theorists, and the divisions within those various umbrella groups. We offer a developmental map of a therapy group and end with a section on the research in group efficacy and applicability.
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