South East Training - Business Process Modelling Toolkit
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First Review - Basic Notation
- Start events include: none start events, message start events and timer start events.
- A none start event means the trigger is unspecified. Sub-processes must have a none start event.
- A message start event means the process is triggered by an outside event. These cannot be used within a sub-process.
- A timer start event means the trigger is a scheduled event. Again, these cannot be used within a sub-process.
- End events include: none end events, message end events and terminal events.
- A none end event ends the process and no results signal is thrown.
- A message end event signifies a message is sent when the event is reached.
- A terminal end event immediately ends a process, even if other paths are still running. Used within a sub-process, it stops the sub-process but not the main process. No message is sent.
- Exclusive or XOR gateways have one sequence flow in and more than one out. Only one sequence flow can be followed.
- Parallel or AND gateways can be used to represent a parallel split or a parallel join.
- Parallel splits have one sequence flow in and more than one out; all paths are followed.
- Parallel joins have more than one path in but only one flow out. All incoming paths must arrive before flow out.
- Parallel paths do not need to join downstream but all paths must complete for the process or sub-process to complete.
Sequence and Message Flow
- Sequence flow links activities, gateways and events in a single pool. You cannot have sequence flow between pools.
- Message flow represents a signal flowing between pools. You cannot have message flow within a pool.
- Link events are used to link diagrams that spread over more than one page. There are two sorts:
- Throwing link event - this throws the sequence to the next page
- Catching link event - this catches the sequence flow from the previous page.