Acknowledgment Model  | Scenario  | Event Status  | 
ACK and Reset required  | - Event handling started (and at least one event-handling command sent)
 - Event source back to Quiet
  
 | Unprocessed 
Waiting for condition 
Ready to be reset 
Waiting for condition (due to mandatory steps) 
Ready to be closed 
Closed
  | 
- Event handling not started yet (and no event-handling command sent yet)
 - Event source back to Quiet
  
 | Unprocessed 
Ready to be reset 
Waiting for condition (due to mandatory steps) 
Ready to be closed 
Closed
  | 
No Reset (ACK only required)  | - Event handling started (and at least one event-handling command sent)
 - Event source back to Quiet
  
 | Unprocessed 
Waiting for condition 
Waiting for condition (due to mandatory steps) 
Ready to be closed 
Closed
  | 
- Event handling not started yet (and no event-handling command sent yet)
 - Event source back to Quiet
  
 | Unprocessed 
Waiting for condition (due to mandatory steps) 
Ready to be closed 
Closed
  | 
No ACK, No Reset  | - Event handling started (and at least one event-handling command sent)
 - Event source back to Quiet
  
 | Waiting for condition 
Waiting for condition (due to mandatory steps)  
Ready to be closed 
Closed
  | 
- Event handling not started yet (and no event-handling command sent yet)
 - Event source back to Quiet
  
 | Waiting for condition (due to mandatory steps)  
Ready to be closed 
Closed
  | 
Optional ACK, No Reset  | - Event handling started (and at least one event-handling command sent)
 - Event source back to Quiet
  
 | Unprocessed 
Waiting for condition 
Waiting for condition (due to mandatory steps) 
Ready to be closed 
Closed
  | 
- Event handling not started yet (and no event-handling command sent yet)
 - Event source back to Quiet
  
 | Unprocessed 
Waiting for condition (due to mandatory steps) 
Ready to be closed 
Closed
  |