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By Jan Mendling

Business technique modeling performs an incredible function within the administration of industrial strategies. As necessary layout artifacts, enterprise method versions are topic to caliber issues. The absence of formal blunders corresponding to deadlocks is of paramount significance for the next implementation of the process.

In his booklet Jan Mendling develops a framework for the detection of formal error in enterprise strategy types and the prediction of errors chance in accordance with caliber attributes of those versions (metrics). He offers an exact description of Event-driven approach Chains (EPCs), their control-flow semantics and an appropriate correctness criterion known as EPC soundness.

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Rosemann introduces an ET-connector that explicitly models a decision table and a so-called OR1 connector to mark branches that are always executed [358]. The motivation of both these proposals is to offer a straightforward way to model certain behavior. In contrast, the works of Rittgen are motivated by semantic ambiguities of the OR-join (see [349, 350]). 3. The aim of Thomas et al. [426, 21, 423] is to provide modeling support for decisions that are taken based on fuzzy information. The authors introduce a fuzzy XOR-connector that takes multiple inputs and triggers alternative outputs.

The start event loan is requested signals the start of the process and the precondition to execute the record loan request function. 1. EPC for a loan request process [325] offer further products 19 20 2 Event-Driven Process Chains (EPC) risk assessment after the XOR-join connector. The subsequent XOR-split connector indicates a decision. In case of a negative risk assessment, the function check client assessment is performed. The following second XOR-split marks another decision: in case of a negative client assessment the process ends with a rejection of the loan request; in case of a positive client assessment the conduct risk assessment function is executed a second time under consideration of the positive client assessment.

If there are several OR-joins used in sequence only the first one will be synchronized. Therefore this formalization –though elaborate– provides only a partial solution to the formalization of the OR-join. Van der Aalst and Ter Hofstede define a workflow language called YAWL [11] which also offers an OR-join with non-local semantics. As Mendling, Moser, and Neumann propose transformation semantics for EPCs based on YAWL [274], we will discuss how the OR-join behavior is formalized in YAWL. In [11], the authors propose a definition of the transition relation R(P ) with a reference to a second transition relation P that ignores all OR-joins.

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