System Process Sequence Flows, Events and Message Flows
Sequence flows
Organization of tasks in the system process is represented by sequence flows between tasks.
A sequence flow is used to show the order in which the steps of a process will be performed. A sequence flow has only one source and only one target.
Events
Events represent facts occurring during process execution.
An event represents a fact occurring during execution of a process, for example a new contract concluded with a supplier. An event marks the impact on process progress of a phenomenon internal or external to the process. There are different natures of events: start events, catch events, throw events and end events.
An example is the start or end of the system process.
Start
Final
The event can also be sending or receiving a message flow.
Message flows
Message flows represent exchanges between the system process and the exterior.
A message flow is information flowing within an enterprise or exchanged between the enterprise and its business environment. A message flow can carry a content.
A message flow can be linked to an event of message type.
