There are two ways to tell if the timing belt has been replaced. One is obvious-you are looking at a service receipt showing the replacement.
Swimlane diagrams are used whenever you need to show activities, tasks, or process steps which are being performed by different actors/roles. You can use swimlanes to group activities in an activity diagram or process flow by any category what you need: by role, by system, by department, etc.
What is a Swim Lane Map? A swim lane map is similar to a flowchart in that it maps out a process, decisions, and loops; however, a swim lane map places events and actions in lanes to delineate a person/group responsible, or a specific subprocess. A swim lane map has three elements: time, people (or job functions), and tasks/processes.