are two notations that can be used to model the same processes: a subset of the activity diagram elements have a similar semantic than BPMN elements, despite the smaller and less expressive set of symbols. A study showed that both types of process models appear to have the same level of readability for inexperienced users, despite the higher formal constraints of an activity diagram. See also DRAKON Business process management Business process modeling Comparison of Business Process Model and Notation modeling tools CMMN (Case Management Model and Notation) Process Driven Messaging Service Function model Functional software architecture Workflow patterns Service Component Architecture XPDL YAWL References Further reading Ryan K. L. Ko, Stephen S. G. Lee, Eng Wah Lee (2009) Business Process Management (BPM) Standards: A Survey. In: Business Process Management Journal, Emerald Group Publishing Limited. Volume 15 Issue 5. ISSN 1463-7154. PDF External links OMG BPMN Specification BPMN Tool Matrix BPMN Information Home Page OMG information page for BPMN. Diagrams Business process modelling ISO standards Specification languages Modeling languages Notation