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.
Safety on and near the water is an issue for the weekend sail boater as well as for military and rescue personnel. Flotation devices are an important part of water safety. Full-body, industrial survival suits and simple water ski belts are two extremes in the family of personal flotation devices available. Although they differ tremendously in the amount of protection, the goal of all safety apparel is survival.