This document discusses models of team evolution. It defines a team as a collection of interdependent individuals who share responsibility for outcomes and see themselves as a unit within an organization. It mentions concepts from agile such as the Ringelmann effect, Apollo syndrome, small teams, self-organization, autonomy, responsibility, awareness, and trust and respect among cross-functional teams. It also references the Dexler-Sibbet model and notes that a successful team is an effective team.