Final answer:
Data flow testing is a control structure testing technique that focuses on exercising the logical conditions in a program module to design test cases. It selects test paths based on the locations and users of variables to ensure comprehensive testing.
Step-by-step explanation:
Data flow testing is a control structure testing technique that focuses on exercising the logical conditions in a program module to design test cases. It selects test paths based on the locations and users of variables to ensure comprehensive testing. However, it does not rely on basis path testing or specifically target the validity of loop constructs.