This is an activity diagram example for the proposal process.
Activity diagrams also describe the roles and areas of responsibilities in the business – in other words who is responsible for doing what in the business. Roles and areas of responsibilities are documented as columns (UML swimlanes) in the activity diagram. Swimlanes show which business workers participate in the realization of the workflow
This activity diagram documenting how the business performs a Proposal process, with three areas of responsibilities (Customer Sales Interface, Proposal Owner, and Quote Owner)