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Pair testing strategy in an Agile environment
Pair testing puts two people on one test session, one driving and one reviewing. Learn the roles, session structure, benefits, and when to use it in Agile.
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Pair testing in an Agile environment puts two people on one test session, one driving the application and one reviewing and taking notes. The two roles come from pair programming, and a session runs no longer than 90 minutes with the pair swapping the driver role halfway through. This guide covers what pair testing is, its advantages, who can do it, its boundaries and challenges, when to run it, how to perform it, how it compares to pair programming, and whether an AI assistant can be one half of the pair.
Key Takeaways
- Pair testing puts two people on one workstation or one shared screen, where one person drives the application and the other analyzes, reviews, and takes notes.
- Pair testing is a form of ad-hoc testing derived from pair programming, and pair testing complements regression and automated testing rather than replacing either one.
- A tester can pair with a developer, another tester, a business analyst, a product manager, a documentation writer, or a customer, because pair testing is not limited to testing roles.
- A pair testing session should run no longer than 90 minutes, and one workable split is 20 minutes of briefing, 50 minutes of testing with a role swap halfway, and 20 minutes of logging defects.
- Pair testing resolves defects faster because the two people investigate a fault together in the session instead of passing the fault back and forth through written reports.
- An AI assistant can take the driver role in a pair testing session, but the test charter and the knowledge exchanged between two colleagues stay with the people.
What is Pair Testing?
Pair testing is an important software testing approach that includes two individuals or team members working on a single workstation/keyboard to evaluate various parts of a software system. This sort of testing is classified as ad-hoc testing since it involves pairing two people to work on the same software product, on the same machine or on one shared screen. During pair testing, both persons are responsible for separate tasks that check the software's quality and functionality. While one is in charge of testing, the other is in charge of analyzing and reviewing the process. As a result, with the help of this approach, one may quickly undertake rigorous software testing while saving time and money.
Key Takeaway: Pair testing is an ad-hoc approach in which two people share one workstation or screen, with one person exercising the software and the other analyzing and reviewing what happens.
What are the Advantages of Pair Testing?
While pair testing may not be appropriate for every team, it has various advantages:
Aids in developing new perceptions and approaches, which leads to improved effectiveness.
Working with people who have varied skill sets allows testers to look at software from a new and distinct perspective. It also aids in the comprehensive comprehension of the program. People who have been working on the same program for a long time are familiar with the functionality and may not have the correct set of eyes for an end-user perspective. A new set of eyes may see something that was previously missed.
Aids in increasing the effectiveness of testing
Defects may go undetected when a tester has been working on the same system for a long time. As a consequence, when they pair with someone new, those new eyes may detect such flaws and ensure that they are not exposed to customers.
It aids in breaking down silos and creating better teamwork
Because of the nature of their work, developers and testers typically operate in silos. Pair testing helps to break down silos and improves collaboration among team members with varying job titles. It also promotes information exchange and provides an understanding of each other's duties. Aside from that, it aids in the development of intern-team partnerships.
It promotes knowledge sharing
Learning from real-world examples in software testing can be more successful than learning from manuals. A walkthrough in which questions and answers are instantaneous might be extremely useful to both partners. Pair Testing is a good approach for individuals, particularly novices, to learn from their peers by seeing what they doing.
Think About Moving Beyond
Individually, our thinking might be limited, and we may continue to do things in our accustomed ways, but working together encourages us to think beyond. Pair testing necessitates two individuals sitting together, discussing, and working together. The same feature or narrative is studied from a different angle, which serves to broaden the reference user base.
Problems are resolved more quickly
When two individuals collaborate, things happen faster since pair testing eliminates back-and-forth reporting, allowing any found faults to be resolved more immediately during the investigation. A developer and tester team can help quickly replicate issues, identify root causes, and solve them. A tester and business analyst team assists the tester in better understanding the feature need and achieving larger test coverage. A tester and tester combination facilitates the use of cross-functional expertise and the avoidance of dependency delays.
Key Takeaway: The advantages of pair testing are fresh perspectives on a familiar product, defects a long-time tester would miss, fewer silos between developers and testers, faster knowledge sharing, and quicker problem resolution.
Who Can Do Pair Testing?
Pair testing with a developer or another tester is common, but remember that these are not the only disciplines that can accomplish it. A documentation writer can contact a tester to find out what will be included in the future release of the program. The tester will then walk the documentation writer through the new features and produce the documentation that is required for the next release. A customer may raise a problem that must be examined. The tester will replicate the error situation with the customer to see what is occurring.
A business analyst or solution designer can also pay the tester a visit to go through the feature. They may ask, "What happens if you do this?" while doing particular tests at a specific time. A rigorous exploratory test begins here, and the tester may discover some defects. My employees use pair testing as an essential element of their development process. They are doing it in various combinations, such as testers working with developers to evaluate new code before merging, testers working with other testers to test particular flows, testers working with product managers to validate requirements, and so on.
You can pair test with practically anyone. I was once discussing a matter with my project coordinator regarding an issue with the application. I saw the problem as well, but I couldn't figure it out. While assessing the scenario and conducting some pair testing with the project coordinator, it seemed to me that a feature I was working on appeared to conflict, under certain situations, in that area of the program. This proved to be a critical defect, necessitating a quick remedy for a back-end system. I could have solved the problem on my own, but partnering aided us in finding it faster.
Key Takeaway: Anyone with a stake in the feature can pair test, including developers, other testers, documentation writers, business analysts, product managers, and customers reproducing a problem they reported.
Boundaries and Challenges of Pair Testing
Even though pair testing is a very useful testing approach, the team still faces a few challenges when carrying out its procedures. These challenges are:
After-session defect reportingOpposition to the new change
By nature, most organizations oppose a significant shift. Managers may expect testers to complete more work by working on many projects concurrently. They may also be concerned about cutting productivity and delaying time-to-market. Two testers will need considerably less time to test than one tester alone. When done correctly, pair testing saves time and speeds up releases. Assume you're doing pair testing with someone from another team. You hire someone to test your product for a time constraint. Furthermore, this can assist testers from various teams to form stronger ties and support one another in their releases. Obtain agreement from your management and stakeholders. Explain your goal and the potential effect of the new program, as well as the benefits of pair testing, and address their concerns.
Avoid typical mistakes
Mentoring may be necessary for non-testers who do not have testing expertise. Testers must keep the pair-testing session focused and on track. Be open to opposing perspectives and respect other people's ideas and beliefs. Furthermore, pair testing is not a method for having someone on the team perform test cases while training and monitoring them. Finally, when pair testing, the pair may decide on the sorts of testing they wish to undertake based on the context of their project. Pair testing, on the other hand, is neither a replacement for nor justification for skipping any form of testing.
My 2 Cents: Pair testing is a great complement to regression and automated testing, and it may save time for smaller teams. Of course, it is not a substitute for other sorts of critical testing activities. Pair testing may be challenging to integrate into an existing development process in certain bigger firms. Waiting for a phase transition or the start of a new project is a smart way to implement pair testing in a specific area.
Key Takeaway: The main obstacles to pair testing are management resistance over perceived lost productivity, non-testers who need mentoring before a session, and the mistake of treating pair testing as a substitute for other forms of testing.
When to Do Pair Testing?
I frequently hold brief pair testing sessions with members of my Group. These occur throughout the software development lifecycle, either in a single sprint or over multiple sprints. You may also utilize pair testing as a learning opportunity, such as bringing a new colleague or a junior tester up to speed on the application by testing together.
Support for or from other professions might also result in a pair-testing session. While reviewing some documentation, you may ask a designer some questions about how a feature would operate, and before you know it, you're working together on a whiteboard, discussing possible situations connected to the product. From another perspective, the business analyst may approach you and ask how the feature is functioning, and you may wind up having a pair-testing session to determine whether the product can be improved.
When a problem has to be investigated, pair testing can also be used. You can seek help from another team member (either a tester or someone else), or you may be requested to investigate a client concern by a customer service person. These are all excellent possibilities for pair testing, but they can also occur without your knowledge. Regularly, I conduct pair testing with my business analyst. We test some feature tags together to see whether the analytics are functioning, and I run the test while the business analyst examines the results.
These sessions work just as well when the two of you sit in different cities, and the same idea scales up when a whole team wants in. Andrea Jensen covers that larger format in her XP Series session on setting up and running effective ensemble sessions remotely, from preparing the group beforehand to keeping everyone contributing once the call starts.
Key Takeaway: Pair testing fits onboarding a new or junior tester, investigating a reported problem, and answering a designer or business analyst question about a feature, and the sessions work just as well when the two people sit in different cities.
How to perform pair testing
If you want to actively begin performing some pair testing, partner up with a coworker you trust and who believes in the notion. You can decide on the emphasis and scope of the pair testing session together. Prepare your activities for your pair testing ahead of time. Set up an environment where you can test together without issues. This includes a desk, tools for working with the application, and a time frame when you can work together uninterrupted. You can accomplish this with management consent or on your own. Evaluate the outcome and convey it to your stakeholders.
Name the two roles before the session starts. The driver holds the keyboard and works the application. The navigator watches, asks questions, takes notes, and decides what the pair looks at next. Llewellyn Falco's strong-style pairing adds one rule on top: for an idea to reach the screen, it has to pass through the other person's hands. In a test session that rule stops the more experienced tester from taking over the keyboard, and it keeps the junior partner doing the work instead of watching it. Swap the roles on a timer rather than waiting for someone to get stuck.
Strong-style is one of two ways to run the session. The Ministry of Testing glossary entry on pair testing separates a formal style, where the navigator decides what to investigate and the driver follows those instructions, from an informal style, where the two people drop the strict roles and talk ideas through as they go. Use the formal style when one partner is new to the product or the pair keeps drifting off the plan. Use the informal style when both people know the feature well and the session is an open investigation rather than a walkthrough.
Pair testing advantages are maximized when you use an appropriate process:
Pre-session activities
The key to pair testing success is preparation:
- Find a companion for your next round of pair testing. Share the invitation at least three days in advance.
- Create the necessary setup and share it with the invitee.
- Create and distribute a high-level strategy that includes domains to test and associated risks, devices, tools to use, objectives, anticipated session outcomes, and so on.
- Share the materials that the invitee must review and clear up any confusion. Requirements, user stories, designs, and other accessible documents are examples.
During the session
Pair testing sessions should last no more than 90 minutes. Experiment with different time divisions to find out what works best for you. For example, consider the following time split for a 90-minute session:
- 20 minutes - The inviter conveys the strategy, goals, and other necessary instructions to the invitee (a tester from another team/person accepts the invitation). Even though the pair is jointly accountable for the result of the pair testing session. The inviter is responsible for optimizing the output of the session.
You can also use the following checklist:
- Determine the test scenarios you wish to work on
- Determine who you want to collaborate with and what each person's function will be.
- What do you hope to gain by working with this particular person?
- What do you hope to gain by working with this particular person? Will the equipment be operated by one person the entire time, or will you switch?
- Determine a goal for your pair-testing session. Do you wish to report issues or make suggestions for new features? Maybe you want to define which tests should be automated, or maybe you want to do all of the above.
- Determine who you will present your findings to if they deviate from your standard report.
- It should also be made clear if they can transfer responsibilities during the process.
- 50 minutes - Time for the pair to focus on exploring the system under testing. The session is led by one of the pair, while the other reviews, analyzes, and documents significant items. After ~25 minutes, the pair switches places. You can also change the mode based on a specific task.
- 20 minutes - If there are any issues, log them once the session has ended. Make comprehensive bug reports as well, including any unexpected disparities or abnormalities that may have arisen.
Key Takeaway: Running a pair testing session well means naming the driver and the navigator up front, sharing the plan and the setup with the partner at least three days ahead, capping the session at 90 minutes, and swapping the two roles on a timer.
Pair Programming vs. Pair Testing
If a developer requests that you investigate a feature and see how it works, you may find yourself in a session where some code is rewritten or even new code is created. You are pair programming in this case. The result of the pair session is new or rewritten code, and the developer is in charge. When you ask a developer to check into an issue you've discovered in his code, you're evaluating if it's a test error or a real problem together. You are pair-testing in this case. The pair session yields information on whether the problem is a bug, and the tester is in command.
When you and a developer collaborate on automation, you are pair testing one minute and pair programming the next. You may not even notice the difference at times. Regularly, my teams are collaborating to develop code to assist our testing, such as unit tests, user interface tests, end-to-end tests, and regression testing. We both run these tests to check if they are successful. The developers code-review the automation tests I wrote to determine if they need to be improved, and we occasionally rework them directly during our pair sessions.
When that automation code starts as a draft from a coding assistant, the pair has a different job. A generated test usually compiles, runs, and passes, so nobody questions it. Sit with the developer who wrote the prompt and read the assertions out loud. Check that each assertion would fail if the behavior under test broke, that the negative and boundary cases exist, and that a mock has not replaced the integration you meant to cover. The common failure is a test that asserts the implementation back to itself, and the reviewer who did not write the prompt is the one who spots it.
What can you anticipate from an efficient pair-testing session?
To make pair testing a success, you must give some sort of tangible outcome. There may be various deliverables:
- Automated tests: A test designed and automated in collaboration with your developer will be included in the regression test suite. These new tests will free you from repetitive regression testing efforts and allow you to concentrate on real problems.
- Session reports: When running tests in pairs, one person drives while the other takes notes. It's a good idea to put these notes down so that the knowledge may be communicated to other members of the team.
- Sharing Information: Information for stakeholders might be the test plan you wrote, the tests you performed based on your test hypotheses, or anything captured in your session results. Information can also include bugs that you discovered, reported, and retested. All of this information is useful to stakeholders since it informs them on how to progress.
- Test documentation: You will create documentation when preparing for tests. This will result in two major documents: a test plan and a set of test thoughts to help your execution.
- Defect reports: While investigating an incident with a developer or a customer, you may discover that it is caused by a bug. Your bug report will get it addressed.
- shared knowledge: While shared knowledge is not acknowledged as a concrete product, I believe it is vital to emphasize it as a result. Pairing signifies those two experts on the subject collaborated on a test, removing the possibility of a single point of failure and increasing trust in your tests.
Key Takeaway: Pair programming ends with new or rewritten code and the developer in charge, while pair testing ends with a judgment on whether a problem is a real bug and the tester in charge.
Can an AI Assistant Be One Half of the Pair?
An AI assistant can hold the driver role in a pair testing session. It runs the steps while a human navigator decides what to look at next and rules on what counts as a defect. The split works because the two jobs need different things. Driving needs speed and accuracy. Navigating needs product context, and that still sits with the person.
Two open tools make this workable. Microsoft's Playwright MCP server drives a real browser through what its README calls "structured accessibility snapshots, bypassing the need for screenshots or visually-tuned models", so each action the assistant takes is readable text you can check rather than a guess at a picture. Google's Chrome DevTools MCP, published in September 2025, adds console logs, network requests, and performance traces to the same session, so the assistant can reproduce a defect and then show the failing request behind it. Both connect through the Model Context Protocol, an open standard for connecting AI applications to external tools and data sources.
Keep two things with the human. The first is the charter. Elisabeth Hendrickson gives a full chapter of Explore It! (The Pragmatic Programmers, 2013) to chartering explorations, and a charter encodes what your team currently thinks is risky, which is not knowledge the assistant holds. The second is the exchange between the two people. A developer who pairs with a tester leaves the session understanding where the risk sits, and the tester leaves understanding how the feature is built. An assistant carries none of that back to anyone. Use it for the long repetitive passes, and keep at least one session per sprint between two people.
Key Takeaway: An AI assistant can drive a pair testing session through tools such as the Playwright MCP server or Chrome DevTools MCP, but the test charter and the learning that passes between two colleagues stay with the people.
Conclusion
Pair testing necessitates fewer pre-testing actions than normal. Although it may appear simple, the outcome of the entire procedure depends on the team members' proactivity. The basic objective of pair testing is the phrase "two heads are better than one." A review or walkthrough involving two individuals can increase trust in the developed system. Overall, it helps to accelerate testing and offer a higher-quality product with substantially less work or added expense.
Author
David Tzemach
Blogs: 46
David Tzemach is a software quality and engineering leader with 19+ years of experience in software testing, quality assurance, and large-scale R&D operations. He specializes in building QA organizations from scratch, defining quality frameworks, and implementing agile and shift-left testing practices across enterprise environments. David has served as Head of QA and QA Architect, authored multiple books on agile quality and testing, and actively contributes to the testing community through his QualityBreach platform and publications.
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