www.prismmodelchecker.org
[HS13] Luke Herbert and Robin Sharp. Precise Quantitative Analysis of Probabilistic Business Process Model and Notation Workflows. J. Comput. Inf. Sci. Eng., 13(1). 2013. [Translates a subset of the Business Process Modelling and Notation (BPMN) language into PRISM, to allow probabilistic model checking of business workflows.]
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