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Often, at the time when a performance model is built, some of its input parameters are not known exactly. This can be for a variety of reasons, such as the system itself not having been completed, a benchmarking process not yet having been carried out, or that precise estimates for the parameters are very difficult to obtain. In these situations, interval values can be used to express the uncertainties of the input parameters and sensitivity studies of performance models have the potential todoi:10.1109/mascot.2002.1167087 dblp:conf/mascots/LladoLH02 fatcat:2rz32ip6hzfubnibxu7p47qhje