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Web processes must often operate in volatile environments where the quality of service parameters of the participating service providers change during the life time of the process. In order to remain optimal, the Web process must adapt to these changes. Adaptation requires knowledge about the parameter changes of each of the service providers and using this knowledge to determine whether the Web process should make a different more optimal decision. Previously, we defined a mechanism called thedoi:10.1145/1242572.1242710 dblp:conf/www/HarneyD07 fatcat:5hfq5z7zpncmjejsjhf3okkmey