When executing the interoperability testing, test system firstly creates one MTC and then generates two PTCs via MTC. Each PTC is responsible for one system under test, and the interactions between MTC and PTC are managed by the Component Manager [6]. When carrying out the performance testing, we can create a group of PTCs simultaneously to implement the concurrent operations of the system under test. The relation between MTC and PTC and the calling process in concurrent testing are shown in Fig. 62.4.