Which method is considered a specification-based test case design method?

The method recognized as a specification-based test case design approach is boundary value analysis. This technique is grounded in the principle of testing the values at the boundaries of input domains rather than focusing on arbitrary values within those domains. By assessing these edge cases, boundary value analysis helps uncover errors that typically occur at the extremes of input ranges, ensuring comprehensive coverage of expected behavior as specified in the requirements.

While other methods listed have their own significance, they do not fit the classification of specification-based design in the same way. Control flow testing primarily revolves around the structure of the code rather than specific requirements, focusing on how different paths through the code execute. White-box testing similarly centers on the internal workings and logic of the software, evaluating its code against expected paths without directly aligning with user requirements. Static analysis involves examining code for potential issues without executing it, again not concerned with validating Specification under specific input conditions.

In summary, boundary value analysis stands out as a specification-based method because it directly correlates to the specified input ranges and the behaviors expected at those limits.