Process graph
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A Process-graph is a directed bigraph used in workflow modelling.
The vertices are of two types, operation and material. The two vertex types form two disjunctive sets. The edges of the graph link the material and operation units. An edge from an operation vertex (O) connects to a material vertex (M) if M is the output of O, such as a 'document' (material) that is output by a 'write-up' (operation). An edge from M to O indicates that M is element of the input set of O, e.g. a document may be input to a 'review' operation.