10 Usability Testing Interview Questions and Answers for UX Researchers

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If you're preparing for ux researcher interviews, see also our comprehensive interview questions and answers for the following ux researcher specializations:

1. Can you walk me through your process for conducting a usability test?

When conducting a usability test, my process involves the following steps:

  1. Defining the purpose and goals: First, I make sure to clearly define the purpose and goals of the test. This involves identifying the target audience, the specific tasks or actions they will be attempting during the test, and the metrics I will use to measure success.
  2. Determining the methodology: Next, I determine the best methodology for conducting the test based on the purpose and goals. This could include in-person testing, remote testing, moderated or unmoderated testing, and more.
  3. Developing the test plan: Once the methodology has been determined, I develop a detailed test plan. This includes creating a script for the test, outlining the specific tasks the participant will need to complete, and developing any necessary documentation or materials.
  4. Recruiting participants: A critical component of usability testing is recruiting the right participants. I typically use a combination of targeted outreach and paid recruiting services to find users who match the desired criteria.
  5. Conducting the test: During the test, I observe the participant as they attempt to complete the tasks outlined in the test plan. I also take detailed notes on any comments or feedback they provide.
  6. Collecting and analyzing data: After the test is complete, I analyze the data collected during the test. This could include metrics such as completion rates, time on task, and error rates.
  7. Reporting findings: Finally, I compile my findings into a report that includes both quantitative and qualitative data. This report may include recommendations for improvements to the interface or design based on the data collected, as well as any insights or observations from the testing process.

By following this process, I have been able to consistently gather valuable insights into user behavior and preferences that have directly led to improved product design and user experience. For example, in a recent test conducted for a mobile app, we were able to identify a confusing navigation structure that was leading to high rates of user drop-offs. Using the data collected from the test, we were able to implement a simplified navigation structure that resulted in a 20% increase in user retention.

2. What are some common techniques you use for recruiting participants for usability testing?

There are several techniques that I have used to recruit participants for usability testing:

  1. Sending out recruitment emails to past participants who have expressed interest in participating again. This has yielded a response rate of around 50%, which helps in finding participants quickly.
  2. Creating social media posts and paid ads on platforms such as Facebook and LinkedIn to reach a wider audience. With these efforts, we were able to recruit 30 participants within a week.
  3. Using online forums such as Reddit and Quora to directly reach out to potential participants who fit our target audience. This approach has resulted in a 25% response rate, allowing us to recruit participants from across the world.
  4. Partnering with universities and offering compensation for participants. This strategy has worked well in engaging a diverse group of participants, with a response rate of over 60%.
  5. Working with online recruiting agencies that specialize in finding participants for usability testing. This is a more expensive option, but it has been effective in quickly finding participants who match complex criteria.

Overall, I have found that using a combination of these techniques has been most effective for recruiting participants for usability testing. By leveraging various channels, we are able to ensure diverse participant representation, which leads to more accurate and beneficial test results.

3. How do you choose tasks and scenarios for a usability test?

When choosing tasks and scenarios for a usability test, I take several factors into consideration. First and foremost, I aim to identify the most critical user goals or actions that the product is designed to facilitate. These goals may be informed by user research such as surveys or interviews, or by analyzing task completion rates, user feedback, and other data from analytics tools.

  1. Next, I prioritize these goals based on their business impact or frequency of use. For example, if a key goal of an e-commerce site is to increase purchases, I may focus on testing the checkout process as a top priority.
  2. Once I have prioritized these goals, I create specific scenarios that reflect real-world user situations. These scenarios should be realistic, actionable, and relevant to the target audience, but also provide enough freedom for participants to approach the task in their own way. For example, a scenario for an online banking app could be "You've received your paycheck and want to deposit it into your savings account. Walk me through the steps you take."
  3. I then design tasks that align with the scenarios, ensuring that they cover all critical aspects of the user journey. I also consider the difficulty level of each task and aim to strike a balance between easy and challenging tasks that provide valuable insights.

I also take into account any known pain points or issues with the product that have been reported by users, as well as areas of the product that have undergone recent changes. For example, if a new feature has been added to a product, I may want to focus on testing the usability of the interface for this feature.

Finally, I pilot test the tasks and scenarios with a small group of users to ensure that they are clear and relevant, and to identify any issues with the task flow or wording. Based on the results of the pilot test, I iterate on the tasks and scenarios as needed prior to launching the full usability test.

4. How do you analyze and prioritize usability issues found during testing?

When analyzing and prioritizing usability issues found during testing, I follow a three-step process:

  1. Organize issues into categories:

    • Minor usability issues: These issues are often cosmetic and do not significantly affect the user experience or task completion rate. They include things like typos, spacing, and font size issues.
    • Major usability issues: These issues are more critical, as they hinder users' ability to complete tasks and, consequently, affect the overall user experience. For example, when a user is unable to locate essential features or when an application keeps crashing, this falls under this category.
    • Critical usability issues: These are the most severe issues and must be addressed immediately. These issues significantly affect users' ability to complete tasks, and if left unresolved, they can lead to customer dissatisfaction or revenue loss. Examples include security vulnerabilities and broken links.
  2. Quantify the impact:

    Next, I analyze the impact of each usability issue. To do this, I ask myself the following questions:

    • What percentage of users experience this issue?
    • How often do users encounter this issue?
    • What is the impact of this issue on the user experience?

    Based on the answers to these questions, I assign a severity level to each issue.

  3. Prioritize based on impact:

    Finally, I prioritize each usability issue based on its severity level. To do this, I use a priority matrix that takes into account both the severity level and the frequency of the issue. For example, a critical usability issue that affects 50% of users would be assigned a higher priority than a major usability issue that only affects 10% of users.

For example, in a recent usability test I conducted on an e-commerce website, I identified three critical usability issues: users were unable to complete a purchase because of a broken checkout link, users were unable to view product images, and users were not able to log in to their account. By quantifying the impact of each usability issue, I found that the checkout link issue affected 60% of users, the product image issue affected 30% of users, and the login issue affected 10% of users. Using my priority matrix, I assigned the highest priority to the checkout link issue, followed by the product image issue and then the login issue.

5. Can you describe a difficult challenge you faced during a usability test and how you overcame it?

During a usability test for a mobile app, we found that users were confused about how to complete a certain task. The task involved navigating between different screens to find a specific piece of information.

We tried a few different solutions, such as adding more prominent navigation buttons and reorganizing the information hierarchy, but none of them seemed to make a significant improvement. We were getting frustrated and concerned that the usability issue may not be resolvable within the timeline and budget allotted.

After discussing the issue with the development team, we decided to try a new approach. We created a simple animation that visually demonstrated the steps needed to complete the task. We included the animation in the onboarding process for new users and made it easily accessible for existing users.

We conducted another round of usability testing after implementing the animation and saw a significant improvement in task completion rates. Users’ confusion decreased from 70% to 15%. They were delighted with the helpfulness of the feature, and we received positive feedback in addition to the data.

  1. Our team admitted that we were initially frustrated by the challenges we faced during the usability test
  2. We come up with possible solutions and shared them with the development team
  3. We chose to create a simple animation to visually show users how to complete the tasks
  4. After implementing the animation, we conducted another round of usability testing
  5. We observed a significant improvement in task completion rates, and users’ confusion decreased from 70% to 15%
  6. The animation we created for the mobile App was a helpful feature that users appreciated, and we received positive feedback from the users

6. What role does qualitative data play in your usability testing process?

Qualitative data plays a critical role in my usability testing process. While quantitative data is useful for measuring metrics such as task completion rate or time on task, qualitative data provides insights on why users behave a certain way.

  1. One example of how we utilize qualitative data is through in-depth user interviews. We conduct these interviews after the usability testing sessions to gather feedback on the overall experience and identify pain points. By listening to users' stories and observations, we gain a better understanding of their needs and can make informed decisions on how to iterate the design.
  2. Another way we gather qualitative data is through task analysis. This involves observing users as they complete a specific task and asking questions to better understand their thought process. Task analysis helps us identify areas of confusion or frustration, and inform design decisions that can improve the overall user experience.
  3. We also conduct surveys to gather qualitative data on user satisfaction and overall impressions of the interface. We use Likert scales and open-ended questions to gather both quantitative and qualitative data that can inform our design decisions.

Qualitative data can be subjective, but it provides important context to the numbers and metrics that quantitative data delivers. By combining both types of data, we can gain a complete picture of the user experience and make informed decisions on how to improve it.

7. How do you ensure that your usability testing sessions are accessible for participants with disabilities?

As a UX researcher, I am deeply committed to making sure that our usability testing sessions are accessible to everyone, including individuals with disabilities. To achieve this, I adhere to several best practices:

  1. Recruiting participants with disabilities. When recruiting participants for usability testing sessions, I make sure to include individuals with disabilities in our participant pool. This ensures that we get feedback from a diverse set of perspectives and experiences.
  2. Choosing appropriate testing methods. My team and I take great care to choose testing methods that are appropriate and accessible for all participants. For example, if a participant is deaf or hard of hearing, we might consider using visual aids or written questionnaires to augment verbal communication.
  3. Providing assistive technology. We make sure to provide assistive technology, such as screen readers and adaptive keyboards, to participants who need them. This ensures that everyone can participate fully in the testing session, regardless of their abilities.
  4. Adjusting the testing environment. If a participant has a physical disability that requires special accommodations, we adjust the testing environment to meet their needs. For example, we might make sure that there is adequate space for a wheelchair or provide ergonomic chairs for participants with mobility issues.
  5. Testing the accessibility of our own tools. Before each session, my team and I conduct a thorough accessibility audit of all the tools and materials we will be using for the testing session. This ensures that our own tools are accessible and usable for participants with disabilities.

This approach has proven to be effective in practice. In a recent study I conducted, we recruited four participants with disabilities and received valuable insights on how to improve the accessibility and usability of our product. We also found that accommodating for the unique needs of these individuals not only benefits them, but also improves the usability of our product for all users.

8. Can you discuss a time when you had to adjust your approach to a usability test on the fly?

During a recent usability test for a new mobile app, we had planned to have participants complete a series of tasks on their own while we observed their behavior. However, we quickly realized that the users were struggling with a certain feature of the app and were becoming frustrated.

To prevent the participants from becoming too frustrated and potentially abandoning the test altogether, I adjusted our approach on the fly. I decided to pause the test and have a discussion with the participants about their experience and what was giving them trouble.

  1. First, I asked the participants to describe what they were trying to accomplish.
  2. Next, I showed them an example of how to complete the task successfully.
  3. Then, I asked them to try completing the task again with the example in mind.
  4. Finally, I observed their behavior to see if the adjustments we made to the previous version of the app made any impact on usability.

The data collected during this usability test showed that this adjustment was successful. Before the adjustment, participants were struggling to complete the task, with an average completion time of 2 minutes and 45 seconds. After the adjustment, participants were able to complete the task in an average of only 1 minute and 10 seconds. Additionally, participants reported feeling less frustrated and more confident in their ability to use the app.

This experience taught me the importance of being flexible during usability tests and adjusting our approach on the fly when necessary. This can help improve the overall quality of the data collected and provide a better user experience for the participants.

9. How do you ensure that your usability tests are unbiased?

As a UX Researcher, ensuring unbiased usability testing is crucial in obtaining accurate data and results. One of the ways I ensure this is by developing test scenarios that are neutral and do not favor any particular design or feature. Additionally, I recruit participants who are representative of the target user population, and not biased towards a particular demographic or behavior.

  1. I also use a randomized order of tasks and questions within the usability test to eliminate potential order effects and minimize learning effects.
  2. To further eliminate biases, I use a double-blind testing method where neither the participant nor the moderator knows which design or feature is being tested.
  3. Moreover, I use a consistent and standardized approach in moderating the usability test to avoid any potential leading questions or hints that could skew the results.

Data collected from one of my recent usability tests showed a significant improvement in task completion times for a website’s new checkout process design, as compared to the previous design. The test was conducted using a double-blind method with a randomized order of tasks and questions, and a neutral test scenario. The results were therefore more objective and unbiased, providing valuable insights for the design team to implement the new checkout process.

In summary, by developing neutral test scenarios, recruiting diverse participants, using randomized task orders, double-blind testing, and a standardized approach, I ensure unbiased usability tests, yielding accurate and actionable results.

10. What steps do you take to ensure that stakeholders understand and act upon the findings from usability testing?

When it comes to ensuring that stakeholders understand and act upon usability testing findings, I take a few key steps:

  1. I make sure to involve stakeholders in the testing process from the beginning, so they understand how it works and what to expect.
  2. During testing, I take detailed notes and record the sessions so stakeholders can observe them later.
  3. After testing is complete, I create a comprehensive report that summarizes the findings and includes actionable recommendations for improvement.
  4. I present these findings and recommendations to stakeholders in a clear and concise way, highlighting key insights and providing visualizations of the data.
  5. To ensure that stakeholders act upon these findings, I work closely with them to set achievable goals and establish a timeline for implementing changes based on the usability testing results.

In a recent project where I utilized these techniques, we conducted usability testing on a mobile app for a client. Our findings showed that users were struggling to complete a specific task within the app due to unintuitive design. To ensure stakeholders understood the severity of the issue, we presented them with qualitative feedback from users as well as quantitative data showing a significant drop-off in task completion rate. We then worked with the stakeholder to redesign the task flow and tested it again, resulting in a 30% increase in task completion rate.


Based on the aforementioned usability testing interview questions, UX Researchers can prepare well for their upcoming job interviews. It's also important to remember that interviewers often want to see a candidate's enthusiasm and creativity when answering these questions. If you’re preparing to apply for UX Researcher positions, don't forget to write a great cover letter. You can find a guide to writing an effective cover letter here. Additionally, preparing an impressive CV can be a game-changer. Follow our guide to crafting a stand-out resume here. If you're in the market for a new UX Research job, check out our job board here. We offer a variety of remote positions to fit your needs.

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