User Experience Design Quality Control & Assurance 4 — Questions and Answers
Question 1: A mobile app fails to provide sufficient color contrast for body text. According to WCAG 2.1 Level AA, what is the minimum contrast ratio required for normal text?
- 2.5:1
- 3:1
- 4.5:1 (Correct answer)
- 7:1
Correct answer: 4.5:1
WCAG 2.1 Level AA requires a minimum contrast ratio of 4.5:1 for normal text (below 18pt or 14pt bold) against its background.
Question 2: What is a 'bug bash' in the context of UX/product QA?
- An automated script that runs nightly to identify UI regressions
- A time-boxed event where the entire team collectively tests the product to find as many issues as possible (Correct answer)
- A meeting to formally close resolved bug tickets
- A tool for tracking user-reported issues in production
Correct answer: A time-boxed event where the entire team collectively tests the product to find as many issues as possible
A bug bash is a collaborative, time-boxed session where cross-functional team members simultaneously explore the product to surface bugs and UX issues before launch.
Question 3: Which severity level should a UX issue be assigned if it prevents task completion for all users but has an easy workaround?
- Cosmetic — low priority
- Minor — low priority
- Major — high priority (Correct answer)
- Critical — must fix before release
Correct answer: Major — high priority
An issue that blocks all users from completing a task is major even with a workaround, because not all users will discover it and it degrades the experience significantly.
Question 4: In UX QA, what does 'think-aloud protocol' help evaluators collect?
- Quantitative metrics like task completion rate
- Qualitative data on users' mental models, confusion points, and decision rationale (Correct answer)
- Biometric data such as eye movement and galvanic skin response
- Aggregate behavioral patterns across thousands of sessions
Correct answer: Qualitative data on users' mental models, confusion points, and decision rationale
The think-aloud protocol captures users' verbal reasoning as they interact with a product, revealing mental models, misunderstandings, and decision points that metrics alone cannot show.
Question 5: A QA engineer wants to test that a date picker works correctly across all valid input combinations. Which testing technique is MOST efficient for this?
- Exploratory testing
- Equivalence partitioning and boundary value analysis (Correct answer)
- Smoke testing
- Canary deployment testing
Correct answer: Equivalence partitioning and boundary value analysis
Equivalence partitioning groups valid and invalid inputs into classes, and boundary value analysis tests edge values (e.g., Feb 28/29, Dec 31), covering the most critical cases efficiently.
Question 6: What is the primary risk of relying solely on automated accessibility testing tools for WCAG compliance?
- They are too slow to run in a CI/CD pipeline
- They can only detect roughly 30–40% of WCAG issues; many violations require human judgment (Correct answer)
- They produce too many false negatives for color contrast
- They require a paid license that most teams cannot afford
Correct answer: They can only detect roughly 30–40% of WCAG issues; many violations require human judgment
Automated tools catch only about 30–40% of accessibility issues; problems like logical reading order, keyboard trap detection, and meaningful alt text quality require manual expert review.
Question 7: During QA of a responsive design, a tester resizes the browser to 320px wide and finds text overlapping buttons. What type of defect is this?
- A content strategy defect
- A layout/responsive design defect (Correct answer)
- A performance defect
- A security defect
Correct answer: A layout/responsive design defect
Text overlapping UI elements at a specific viewport width indicates a responsive layout defect, meaning CSS breakpoints or flexible units are not handling that screen size correctly.
User Experience Design Quality Control & Assurance 4
A mobile app fails to provide sufficient color contrast for body text.
According to WCAG 2.1 Level AA, what is the minimum contrast ratio required for normal text?