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The advances in computer and graphic technologies have led to the popular use of multimedia for information exchange. However, multimedia systems are difficult to test. A major reason is that these systems generally exhibit fuzziness in their temporal behaviors. The fuzziness is caused by the existence of non-deterministic factors in their runtime environments, such as system load and network traffic. It complicates the analysis of test results. The problem is aggravated when a test involvesdoi:10.1109/qsic.2004.1357942 dblp:conf/qsic/ChengCT04 fatcat:zt3qzohf2bfyvgjisahlnpbw4y