Part of lp.registry.interfaces
| Class | TeamMembershipStatus | TeamMembership Status |
| Interface | ITeamMembershipSet | A Set for TeamMembership objects. |
| Interface | ITeamParticipation | A TeamParticipation. |
| Class | CyclicalTeamMembershipError | A change resulting in a team membership cycle was attempted. |
| Interface | IJoinTeamEvent | A person/team joined (or tried to join) a team. |
| Interface | ITeamInvitationEvent | A new person/team has been invited to a team. |