When working together, people must share artifacts and coordinate their activities over time. A group of people who are interested in a set of projects. Most people in the community are not partipants in any project. The unit of space for collaboration. Projects have members who play roles.
Projects contain artifacts.
E.g. checking in a file, addnig a new item, adding a member. Conditions on the state of artifacts. E.g., all M1 features implemented, all P1 issues closed.