The sequence diagrams demonstrate how the system should behave during different scenarios. Figure \ref{fig:Scenario1} through Figure \ref{fig:Scenario3} show three different scenarios under different operating conditions. In each diagram, all actors and components involved with the scenario are depicted as lifelines. Events are then generated by operation calls between entities. These calls are depicted by labeled arrows from the initiator to the recipient. In addition, boxes on the lifeline are used to display the active period of involvement in the scenario.