Modular software is often seen as a feature of high quality software , but that assertion only holds true if the modules interact as expected. That is why DO-178C requires that both data coupling and control coupling are shown to be in accordance with requirements.
Section 220.127.116.11.c of the standard requires “analysis to confirm that the requirements-based testing has exercised the data and control coupling between code components” . This directive is designed to ensure that design, integration, and test objectives are met. The document outlines how m easuring control and data coupling can be achieved via a combination of control and data flow analysis , and how that process can be made more efficient through the use of software tools.