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1  Introduction                                                  19
                              Kiepuszewski et al. [131] examined the consequences of various different inter-
                           pretations of workflow routing constructs defined by the Workflow Management
                           Coalition from an expressiveness point of view.
                              There are several comprehensive treatments of Petri nets (e.g., [179,196]). Their
                           use for workflow specification was advocated by Wil van der Aalst [1]. Dufourd et
                           al. [80,81] provide an introduction to reset nets.
                              In 2002, van der Aalst and ter Hofstede defined the YAWL language [15]. The
                           development of the support environment started the following year [6]. The first
                           open-source release of this environment occurred in the same year. In subsequent
                           releases, the functionality was extended considerably. In [219], YAWL and some of
                           its extensions were modeled using CPN Tools.
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