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Most modern business activities are carried out by a combination of computerized tools and human agents. Typical examples are engineering design activities, office procedures, and banking systems. All these human-centered systems are characterized by the interaction among people, and between people and computerized tools. This interaction defines a process, whose effectiveness is essential to ensure the quality of the delivered products and/or services. To support these systems, process-centered environments and workflow management systems have been recently developed. They can be collectively identified with the term process technology. This technology is based on the explicit definition of the process to be followed (the process model). The model specifies the kind of support that has to be provided to human agents. An essential property that process technology mut exhibit is the ability of tolerating …