Software Quality Assurance Practice Exam

Which test case design technique is based on writing test cases around probable types of errors?

1. Identifying equivalence classes

2. Cause-effect graphing

3. Boundary value analysis

4. Error guessing

The correct answer is: Error guessing

The correct choice reflects a technique that specifically aims to anticipate and identify potential errors based on previous experience and understanding of the software. Error guessing is a method where testers use their intuition and expertise to predict areas of the application that might be prone to faults. This technique relies on the knowledge of common mistakes made during development, meaning testers actively try to "guess" what might go wrong. By focusing on probable error types, this technique allows for a more directed approach to testing, emphasizing areas where bugs are most likely to appear. This can often lead to discovering defects that more structured testing methods might overlook. The other techniques, such as identifying equivalence classes and boundary value analysis, focus on systematic ways to cover a range of inputs or conditions rather than leveraging the tester's experience to pinpoint likely error locations. Cause-effect graphing involves mapping relationships in the application's logic, which is more structured and less about anticipating errors based on experience. By understanding the nuances of error guessing, testers can enhance their capabilities in spotting potential issues that other methods may not fully address.