BPMN 2.0 is a standard for business process modeling notation that was developed by BPMI and is now maintained by OMG. BPMN 2.0 extends the capabilities of BPMN 1.2 by formalizing business process execution semantics, defining extensibility mechanisms, and extending the definition of human interaction. The key modeling elements in BPMN 2.0 include pools, lanes, activities, events, gateways, sequence flows, message flows, and associations.