COSA differentiates between synchronous and asynchronous subprocesses. A synchronous subprocess is started by a call activity from within the main process. The main process execution is stopped and can only be continued, when the subprocess has been finished. In contrast to a synchronous subprocess, an asynchronous subprocess is launched or continued by a so-called trigger. Then, this subprocess runs independently of the main process. terug trigger In COSA BPM, if an asynchronous subprocess is called by a trigger, the main process execution can be continued independently of the subprocess. A trigger call can start either a new process instance or an executable work item of an already existing process instance. In COSA DM, you can define triggers that start actions in COSA BPM based on events in COSA DM.