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8 is the growth factor in this segment. In fact, B restructuring at 25% presents the higher growth factor in the interval 0% to 50%. Consequently, such restructuring criterion is the most effective to dynamically manage delays during execution of WI because it permits achievement of the company goal for expressive delays on controlled activity A2, up to 54%, and it does not imply in a significant increase of the load over the computing environment (only affected WI are restructured). It is not possible to predict the exact amount of elapsed time saved after restructuring a workflow instance.

Such disturbances can be transient or perennial, unexpected or intentional, and can affect an expressive number of processes. Figure 12 shows the typical implementation architecture of Telecomm computational infrastructure, which is used in our experimental study. Each telecommunications central T-central has a computer server to support its activities and to manage its controlled lines and switches. In the Telecomm Headquarters, Telecomm-HQ, a computer server supports all the management Copyright © 2005, Idea Group Inc.

Such designs are based on the assumptions that the organizational structure is an efficient way to organize business processes (workflows), and the computational infrastructure has the optimal configuration within the enterprise. However, such assumptions may not hold when unexpected delays happen and when such delays severely hinder the progress of ongoing workflow executions. Typical delays in execution of business workflows are due to various types of failures or disturbances in computational infrastructure, including instabilities in network bandwidth and replacement of low power computing infrastructure in coping with server failures.

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