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One of Business Process Modeling Notation's (BPMN) most important elements is unfortunately also the most misunderstood. It's called a pool, a rectangular shape that serves as a container for a process. So in that sense a pool is synonymous with a process, and that's as basic as you can get. The confusion sets in when you understand that A Business Process Diagram (BPD) - the top-level object in BPMN, describing a single end-to-end business process - frequently contains multiple pools. Usually only one of the pools describes your process, what BPMN calls a private process; the others typically stand for external participants: requesters of your process, service providers to your process, or possibly sources of unsolicited events that affect your process.
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