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In the context of dynamic evolution of workflow processes, the change regionidentifies the part of the old process from which migration to the new processis guaranteed to be inconsistent. However, this approach may lead tooverestimated regions, incorrectly identifying migratable instances asnon-migratable. This overestimation causes delays due to postponement ofimmediate migration. The paper analyzes this overestimation problem on a classof Petri nets models. Structural properties leading to conditions for minimalchange regions and overestimations are developed resulting into classificationof change regions into two types of change regions called Structural ChangeRegions and Perfect Structural Change Regions. Necessary and sufficientconditions for perfect regions are identified. The paper also discusses waysfor computing the same in terms of structural properties of the old and the newprocesses.

A Structural Approach to Dynamic Migration in Petri Net Models of Structured Workflows