User Experience Design User Experience Design Usability Testing & Evaluation 1 — Questions and Answers
Question 1: What is the primary purpose of a usability test?
- To validate visual design choices with stakeholders
- To observe users interacting with a product and identify usability issues (Correct answer)
- To measure server response times
- To determine market pricing for a product
Correct answer: To observe users interacting with a product and identify usability issues
Usability testing observes real users completing tasks with a product to uncover problems, confusion, and areas for improvement.
Question 2: How many participants does Jakob Nielsen recommend for a basic usability test to find the most critical issues?
- 3
- 5 (Correct answer)
- 10
- 20
Correct answer: 5
Nielsen's research shows that 5 users will uncover approximately 85% of a product's usability problems, making it a cost-effective testing threshold.
Question 3: What is a 'think-aloud protocol' in usability testing?
- A script the moderator reads before each session
- Asking participants to verbalize their thoughts as they complete tasks (Correct answer)
- A summary report shared with stakeholders after testing
- A technique for testing voice-controlled interfaces
Correct answer: Asking participants to verbalize their thoughts as they complete tasks
The think-aloud protocol asks participants to narrate their thoughts, feelings, and actions as they use a product, revealing their mental models and confusion points.
Question 4: What is the System Usability Scale (SUS)?
- A 10-item questionnaire that provides a quick measure of perceived usability (Correct answer)
- A government standard for accessible software
- A visual scale for rating interface aesthetics
- A tool for benchmarking server uptime
Correct answer: A 10-item questionnaire that provides a quick measure of perceived usability
The SUS is a reliable, 10-question Likert scale that produces a single score (0–100) indicating overall perceived usability of a product.
Question 5: What does 'task completion rate' measure in usability testing?
- How long it takes to complete a task
- The percentage of users who successfully finish a given task (Correct answer)
- How many errors users make during a task
- The satisfaction rating after completing a task
Correct answer: The percentage of users who successfully finish a given task
Task completion rate is the percentage of test participants who successfully complete a designated task, a key effectiveness metric in usability evaluation.
Question 6: What is a 'benchmark usability test'?
- A test conducted before a product launch only
- A test that establishes baseline performance metrics to compare over time (Correct answer)
- A competitive analysis of rival products
- An automated accessibility test
Correct answer: A test that establishes baseline performance metrics to compare over time
Benchmark usability tests measure specific performance metrics at a point in time so that future design changes can be evaluated against that established baseline.
User Experience Design User Experience Design Usability Testing & Evaluation 1
What is the primary purpose of a usability test?