This document discusses teams and groups in organizations. It defines teams as groups of two or more people who work together to achieve common goals and see themselves as an entity within the organization. There are many types of formal teams in organizations, including departmental teams, production teams, and virtual teams. Groups are defined as having two or more people with a unifying relationship, and informal groups exist primarily for the benefit of members but do not have formal goals. Team effectiveness is measured by achieving goals, satisfying member needs, and maintaining the team over time. Key factors that influence teams include task characteristics, team size and composition, and interdependence between members.