Activity Diagrams are about describing the flow of a process.
This is an activity diagram for checking out equipment. It has several decision points. First does the client have blocks or fines? If they do does the client pay for them? Next the employee searches for the equipment. Is it Available? If it is check it out. If not the client has a decision to either reserve the equipment or just end the transaction.
The Second diagram is the same of the first but with the addition of Swim lanes. Swim lands let you distribute the actions according to what actor or object is responsible. In this case I just split it between the Client and the Employee actors. This could be more detailed depending on the process being described
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