1) An organization is defined as a group of people acting together to achieve common goals. 2) Organizational culture can be understood through its symbols, heroes, rituals and shared values. 3) Groups and teams develop over time through forming, storming, norming, and performing stages as they become more cohesive and productive. 4) Different roles like plant, coordinator, monitor, and implementer contribute uniquely to team performance according to Belbin's team role theory.