This document summarizes key concepts from a chapter about managing groups and teams in organizations. It discusses types of groups like formal and informal groups, as well as periods of group development. It also covers topics like social loafing, team tasks, team roles, and challenges of virtual teams. Additional concepts summarized include self-managed teams, designing effective teams, and decision making models and traps. Leadership styles are briefly touched on, including transformational, transactional, and authentic leadership.