draw a use case

Exercise n.4 1 - Create the use case diagram according to the following elevator control system functional requirements: 1. The elevator control system shall allow the passenger to call the elevator and to select the destination floor; 2. When the passenger pushes the external button to call the elevator), or the internal button to select the destination floor), the central control system switches the button light on; 3. When the passenger calls the elevator or selects the destination floor, the central control system opens/closes the elevator door: 4. When the passenger calls the elevator or selects the destination floor, the central control system moves/stops the elevator to/at the passenger call floor or to at the passenger destination floor. 5. When the passenger leaves the elevator, tho central control system switches the button light of . . Also, describe the use case "Select Floor" by specifying: Use case name Participating actors Description Entry conditions Flow of events (see use case description at point 3. Pay attention: consider JUST the interface events) Exit conditions . ontrol system