Business analysts often spend a lot of time and efforts when it comes to creating a nice decomposition of an organization´s business architecture. Typically the architecture design is driven by organizational or business area requirements. Depending on the frameworks used such as SCOR®, APQC® or DODAF and NAF the process levels describing the implementation of IT systems  may yield to a quite complex architectural construct of nested diagrams and viewpoints. This really challenges QA teams to prepare test-cases for integration and regression tests in the context of user-acceptance testing (UAT) of end-to-end process flows. Here the reverse decomposition technique facilitates the design of perfect test-cases for manual and automated test execution.