The RTM(Requirements Trace Matrix ) is used as a test planning tool to help determine how many tests are required, what types of tests are required, whether tests can be automated or manual, and if any existing tests can be re-used. Using the RTM in this way helps ensure that the resulting tests are most effective.The RTM can serve many purposes over the course of a development project. Initially, it can be used as a planning tool (as illustrated above). Once the tests are developed and Validation Testing has begun, the RTM can be used to help determine the extent of regression test required based on the relationship be requirements, design, code, and tests as illustrated below. When it becomes necessary to perform regression testing, the accurate information included in the RTM will be invaluable in helping to select a reasonable set of tests to run. The RTM can also be used to help analyze the existing test suite.
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