CTFL-UT Exam Dumps : ISTQB Certified Tester-Foundation Level - Usability Testing

SUS (System Usability Scale), SUMI (Software Usability Measurement Inventory), and WAMMI (Website Analysis and Measurement Inventory) are all validated, standardized usability questionnaires that support benchmarking. They allow comparison against known usability scores from a wide variety of systems. These instruments provide numeric scores that can be interpreted using benchmark datasets or industry standards. Therefore, all three—i, ii, and iii—are true, making D the correct answer.

Common mistakes in usability testing include:

Ignoring critical results (ii): A significant issue if findings are not acted upon.

Scheduling the test too late (iv): This can lead to usability problems being discovered too late to be addressed effectively.

Having the wrong focus (v): For instance, focusing on aesthetics instead of usability goals.

Option i ("user is too active") is not a problem—active participation is necessary. Option iii ("no observers involved") is not a typical mistake, since tests can still be valid even with recorded sessions and later review. Hence, the correct answer is A: ii, iv & v are true.

An informal usability review can be conducted by anyone, including stakeholders or developers, and does not require formal usability training or qualifications. It is typically subjective and based on general impressions. In contrast, an expert usability review (also called heuristic evaluation) is conducted by a trained usability expert who applies recognized usability principles. This is what differentiates the two approaches most clearly. Options A and C are misleading; expert reviews can be informal in format, and informal reviews aren't necessarily based solely on opinion. Option D is incorrect since both informal and expert reviews can be conducted individually or in groups.