integration test plan is the base document to proceed with integration testing.integration testing begins after the integration test paln is baselined and the test cases are reviewed and baselined.This test plan talks about the scope of testing the approach taken the entry criteria the types of tests to be conducted testing techniques that are involved the integrity of the appilication or software the risks involved the resources required the scheduled dead lines and the exit criteria.
Any test plan fundamentaly consist basic things Objective Scope Approach Effort and schedule so Integration Test palne discribes all the thinghs related to integration of modules