Fuzzy Resource-Constrained Time Workflow Nets

The underlying proposal of this work is to express in a more realistic way the resource allocation mechanisms when human behavior is considered in Workflow activities. In order to accomplish this, fuzzy sets delimited by possibility distributions are associated with the Petri net models that represent human type resource allocation mechanisms. Additionally, the duration of activities that appear on the routes (control structure) of the Workflow process, are represented by fuzzy time intervals produced through a kind of constraint propagation mechanism. New firing rules based on a joint possibility distribution are then defined. Finally, the model is built using CPN (Colored Petri net) language supported by CPN Tools.