Topic: Integration Test

We need to prepare an Integration Test Plan for a Project that touchs three applications- one web based application and two mainframe based applications. The Integartion test plan has to cover the testing plan for the individual systems as well as the interfaces and of course the behaviour of the three systems together. Does anyone out here in QAForums had any template for this kind of Integration Test Plan which we may tailor for our use? Any help in this regard will be highly appreciated.