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Towards a Usability Assessment of Process Modeling Languages

jan.mendling@wiwi.hu-berlin.deAbstract: Visual process models provide support for analyzing and improving com-plex organizational processes. In this paper, we discuss differences of process mod-eling languages according to their ease of use and quality of user experience. Theseaspects are of importance for learning a modeling language, creating models, and un-derstanding models. Modeling languages can be compared according to criteria asrepresentational clarity, perceptual discriminability, perceptual immediacy, visual ex-pressiveness, and graphic parsimony which are likely to inﬂuence cognitive effective-ness. In particular, we analyze the symbols sets of UML Activity Diagrams, YAWL,BPMN, and EPCs according to these criteria and discuss their strengths and weak-nesses. Based on our ﬁndings, we propose a preliminary evaluation of the cognitiveeffectiveness of these modeling languages, which provides a basis for empirical stud-ies.