Top 25 Functional Testing Interview Questions

December 7, 2023Python Code Nemesis
Top 25 Functional Testing Interview Questions

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Entering the world of software testing might feel like navigating uncharted waters, but fear not! Functional testing, a cornerstone of software quality, is here to ensure applications run smoothly. Whether you’re stepping into the field or have an experienced hand, we’ve compiled a list of the top 25 functional testing interview questions for 2023. 

Let’s embark on this journey, combining practical analogies and technical depth for a successful interview.

Functional Testing Interview Questions for Freshers:

What is Functional Testing? 

Functional testing checks if software behaves according to its requirements and works as anticipated. It ensures that the application’s functions work in accordance with design documents. 

In functional testing, testers go through every feature of the software, like buttons, forms, and links, to make sure they perform as they are expected to. For instance, they check that buttons are clickable, forms can be filled out, and links take users to the right places. 

If anything doesn’t work the way it’s expected to, it’s identified as a “bug” or a problem that needs to be fixed. The aim is to guarantee that users encounter no issues and enjoy a seamless experience while using the software. 

Why is Functional Testing Important?

Functional testing directly influences user satisfaction by making sure that the software works as it should. Users expect applications to work smoothly, and functional testing ensures a positive user experience by catching and rectifying issues before they reach users.

Moreover, functional testing assures the quality and reliability of the software, aligning it with specified requirements and industry standards. This quality assurance not only establishes trust with customers but also helps in cost-effectiveness.

What are Different Types of Functional Testing?

Here are brief explanations of a few different types of functional testing:

Unit Testing: Unit testing involves checking individual components or functions of the software To confirm their proper functioning when tested individually. 

Integration Testing: Integration testing concentrates on validating how different parts or sections of the software collaborate. It ensures that when these pieces interact, they do so seamlessly, preventing integration-related bugs.

System Testing: System testing assesses the complete software system as a single unit. Testers assess the application’s behavior and functionality across various scenarios, mimicking real-world usage to identify any issues that might arise during actual user interactions.

User Acceptance Testing (UAT): UAT involves actual users testing the software to verify it aligns with their needs and expectations It’s the final validation that the software aligns with the users’ needs before it’s released.

Regression Testing: Regression testing ensures that new changes or updates to the software haven’t introduced new issues or broken existing functionalities. 

Smoke Testing: Smoke testing is a quick, high-level check to ensure that the most critical functions of the software are working without major issues. 

Sanity Testing: Sanity testing focuses on specific areas or functionalities of the software after a change or update. 

How is Functional Testing Performed?

Functional testing involves several key steps:

Test Planning: The first step is to plan the functional tests. Testers work with project stakeholders to define test objectives, scope, and requirements. They create a test strategy that outlines the testing approach, the features to be tested, and the testing environment.

Test Case Design: Testers create detailed test cases based on software requirements. These test cases outline specific actions to be performed, including inputs, expected outputs, and any preconditions or prerequisites.

Test Execution: Testers execute the prepared test cases. This involves interacting with the software by clicking buttons, entering data, and following predefined workflows. Testers systematically go through each test case, documenting the results.

Defect Reporting: When testers encounter issues during test execution, they report these defects to the development team using a standardized format. The defect reports provide details about the issue, instructions to recreate it, and its level of seriousness.

Regression Testing: After developers fix reported defects, regression testing is performed. This involves retesting the affected areas to ensure that the fixes did not introduce new issues or impact other functionalities.

Test Reporting: Testers compile test results and create test reports. These reports detail the outcomes of the tests, including any defects found, their severity, and whether the software meets the defined criteria.

Test Closure: Once all test cases have been executed, and defects have been addressed, a test closure report is prepared. This report summarizes the testing process, including achievements, issues, and recommendations for future testing efforts.

Automated Testing (Optional): In some cases, functional testing can be automated using testing tools and scripts. Automated tests speed up testing, especially for repetitive tasks and regression testing.

Continuous Improvement: After testing is complete, the testing team and development team collaborate to analyze the results and identify areas for improvement. Lessons learned from testing are used to enhance the software’s quality and development processes.

Difference between Functional and Non-Functional Testing?

Functional testing validates the application’s software features and functions, while non-functional testing focuses on aspects like performance, security, and usability. While functional testing checks if all buttons on a TV remote work, non-functional testing explores how quickly the TV responds to commands.

AspectFunctional TestingNon-Functional Testing
FocusCore functionality and featuresPerformance, reliability, and other attributes beyond core functionality
Test CriteriaPredefined test cases based on functional specificationsAssessment of qualitative aspects, often without predefined test cases
ExamplesButton functionality, form submissions, calculations, navigationLoad testing, security testing, usability testing
Pass/FailTypically has clear pass/fail criteriaRelies on metrics, benchmarks, and acceptable ranges
User-CentricPrimarily user-centric, ensuring software functions as expected by usersSystem-centric, evaluating how the software operates under different conditions
ObjectiveVerify that software performs its intended functions correctlyAssess various attributes that contribute to the overall user experience
OutcomeFocused on correctness and adherence to requirementsFocused on performance, security, and usability, among others

Explain Unit Testing vs. Functional Testing

Unit testing tests individual units or components of code, while functional testing evaluates the application’s complete functionality. Unit testing resembles tasting individual ingredients before cooking, while functional testing is like savoring the entire dish.

AspectUnit TestingFunctional Testing
FocusIndividual components or functionsEntire software application
Test ScopeHighly specific, one componentBroad, multiple components/features
IsolationThe component under test is often isolatedInteraction between components is considered
Development StageTypically performed during development by developersTypically performed during the QA phase by dedicated testers
AutomationCommonly automated, part of continuous integrationAutomation is used but manual testing is also common, especially for UI
PurposeEnsure the correctness of small code unitsValidate overall software functionality from an end-user perspective
ExampleTesting a single function or methodTesting the entire application, including user interactions

What is Functional Testing vs. Regression Testing?

Functional testing ensures each function works correctly, while regression testing verifies that new changes don’t negatively impact existing functionalities. 

AspectFunctional TestingRegression Testing
FocusCore functionality and featuresEnsuring existing features still work
Test CriteriaPredefined test cases based on functional specificationsPrimarily retesting of previously validated features
ExamplesButton functionality, form submissions, calculations, navigationRechecking login, data storage, and existing features
Pass/FailTypically has clear pass/fail criteriaPrimarily focuses on identifying regressions (failures)
ObjectiveVerify that software performs its intended functions correctlyMake sure that new changes haven’t broken existing code functionality
TimingConducted during development and quality assurance phasesOften performed during regression test cycles before software releases
AutomationAutomation is used but manual testing is also common, especially for UIAutomation is common and integral to frequent regression testing
Changes ConsideredFocuses on new features or changes being testedRecheck existing features after changes to detect unexpected problems

Explain Adhoc Testing

Adhoc testing involves unplanned and random testing to identify defects that might not be overlooked by formal test cases. Adhoc testing mirrors exploring a new city without a map – you’re trying out random spots to uncover hidden gems.

Here’s a breakdown of adhoc testing:

Exploratory Approach: Testers explore the software application without a specific script or set of instructions. They interact with the software as end-users might, trying various actions and inputs to identify unexpected behaviors or defects.

Unscripted Tests: Testers perform unscripted tests, trying different scenarios and actions that are not necessarily documented in any test plan. They might click on elements out of sequence, enter unusual data, or use the software in unexpected ways.

Error Discovery: The primary goal of adhoc testing is to discover defects, errors, or unexpected behaviors that might not be found through scripted testing. Testers aim to uncover issues that might emerge during real-world usage.

Limitations: Adhoc testing might not be suitable for comprehensive test coverage, especially for critical or regulated industries. Structured testing methods are essential for ensuring complete coverage and meeting specific compliance requirements.

How Does ‘Build’ Differ from ‘Release’?

A build is a version of the software, while a release is the distribution of a stable version to users. Think of a build as a blueprint for a cake, while a release is an actual cake presented to everyone at a celebration.

DefinitionA version of the software compiled from the source code, representing a specific point in timeA stable and well-tested version intended for distribution to end-users or customers
ScopeGenerated frequently during development, may contain ongoing changes and updatesInfrequent, occurs at defined points in the development lifecycle, represents a milestone
PurposePrimarily for internal development and testing, allowing developers to test code changesIntended for external stakeholders, including end-users, customers, or clients, for production use
TestingTesting includes unit testing, component testing, and sometimes integration testingComprehensive testing, including functional testing, regression testing, user acceptance testing, and performance testing
StabilityLess stable, may contain bugs or incomplete features, as it’s in active developmentStable and free from critical defects, considered production-ready
Scope of ChangesCan include several changes, from minor code edits to major feature additionsIncludes a well-defined set of changes, often organized into release notes, thoroughly tested and verified

Difference between Monkey Testing and Adhoc Testing?

Monkey testing involves randomly clicking through an application, while adhoc testing is more structured and focuses on specific scenarios. Monkey testing is like letting a curious monkey explore your kitchen, while adhoc testing is more structured, like allowing an adventurous child to explore with guidelines.

State Difference between Alpha and Beta Testing?

Alpha testing is done by internal teams, while beta testing involves external users before public release. Alpha testing is conducted before beta testing. Alpha testing is inviting close friends to sample your new recipe, while beta testing involves inviting neighbors to taste and provide feedback.

AspectAlpha TestingBeta Testing
TimingConducted before Beta TestingConducted after Alpha Testing
PurposeTo identify defects and issues within the organization before releasing to external usersTo gather user feedback, evaluate real-world performance, and uncover issues in a controlled external environment
ParticipantsInternal teams, often developers and testersExternal users or a selected group of customers
ScopeLimited scope, typically focusing on core functionalitiesWider scope, encompassing various user scenarios and real-world usage
EnvironmentTesting usually occurs in a controlled, non-production environmentTesting occurs in a real or simulated production environment
FocusInternal quality assessment and defect identificationReal-world user experience, feedback collection, and validation of product readiness
ControlThe organization has more control over the testing process and environmentLess control over external users’ actions and environments
GoalsConfirm the software works correctly and meets internal standardsCollect user feedback, assess usability, and validate the product’s readiness for public release
DurationGenerally shorter duration compared to Beta TestingTypically a longer testing phase, allowing for more extensive user interactions
Scope of ChangesAlpha versions may still undergo significant changes based on internal feedbackBeta versions are more stable and represent near-final product versions
Feedback UtilizationFeedback primarily influences internal development and refinementFeedback drives final product improvements and fixes for the external release
ConfidentialityOften conducted under non-disclosure agreements to maintain confidentialityInvolves external users who may not be bound by non-disclosure agreements

What are Different Test Techniques Used in Functional Testing?

Functional testing techniques include equivalence partitioning, boundary value analysis, and decision table testing for comprehensive validation. Think of test techniques as various ways to check if a cake is perfectly baked – poking it, smelling it, slicing it.

Here are some common test techniques used in functional testing:

Black Box Testing: This technique focuses on testing the software’s functionality without considering its internal code structure. Testers validate whether the software meets specified requirements and produces expected outputs based on various inputs.

White Box Testing: White box testing examines the internal code and logic of the software. Testers assess how well the code functions, including branch coverage, path coverage, and code execution paths.

Equivalence Partitioning: Equivalence partitioning involves dividing input data into equivalent classes or partitions and testing representative data from each partition. It helps ensure that the software handles different input scenarios effectively.

Boundary Value Analysis (BVA): BVA complements equivalence partitioning by focusing on the boundary values of input partitions. Testers assess how the software behaves at the edges or limits of input ranges, as these often lead to defects.

State Transition Testing: State transition testing is suitable for systems with distinct states. Testers evaluate how the software transitions between different states and whether it performs actions correctly in each state.

Exploratory Testing: Exploratory testing is an unscripted, adhoc approach where testers explore the software, identify issues, and learn about its behavior. It’s valuable for uncovering defects and assessing overall user experience.

Concurrency Testing: Concurrency testing evaluates how the software handles multiple users or processes simultaneously. It’s essential for applications with multi-user support to ensure that concurrent interactions do not lead to data corruption or conflicts.

Compatibility Testing: Compatibility testing assesses how the software performs on different devices, browsers, or operating systems. It ensures that the software functions as expected across various environments.

These test techniques, when used appropriately, contribute to comprehensive functional testing. This helps ensure that the software meets its requirements, functions correctly, and delivers a positive user experience.

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Explain Risk-Based Testing and its Important Factors

Risk-based testing prioritizes test cases based on potential risks, considering critical functionalities and business impact. It focuses on potential pitfalls. Imagine risk-based testing as making sure the dessert is flawless before the main course.

Risk-based testing is a testing approach that places a primary focus on mitigating the most critical and impactful risks to software quality and functionality. The key to effective risk-based testing lies in several critical factors:

First and foremost, Risk Identification is paramount. Teams need to accurately identify risks associated with the software, which can range from technical complexities to business impact and compliance issues. This often requires collaboration across different domains and expertise areas.

After identifying risks, the next action involves conducting a Risk Assessment. Teams evaluate each risk’s potential impact and likelihood. 

Risk Prioritization is next. Risks are categorized into high, medium, and low priority based on their assessment. High-priority risks are those with the most significant potential impact on the project’s success.

The testing strategy is then adjusted to align with these priorities. Test Strategy and planning involve designing test cases and scenarios that specifically target high-priority risks. These test cases receive a higher degree of attention in the overall testing strategy.

Resource allocation is also crucial. Resource Allocation ensures that more resources, including time, budget, and testing personnel, are directed toward mitigating high-priority risks, while lower-priority risks may be addressed in subsequent testing phases.

To effectively address high-priority risks, the Test Coverage is aligned with these priorities. This means that high-priority areas receive more extensive testing, ensuring that the most critical aspects of the software are thoroughly validated.

During the Test Execution phase, close monitoring of identified high-priority risks is essential. Should defects or issues be found in these areas, they are addressed urgently to mitigate potential negative impacts.

Maintaining a Feedback Loop is integral. Continuous communication and feedback loops with stakeholders help in adapting the testing approach as the risk landscape evolves. This ensures that the testing process remains aligned with the project’s changing priorities.

Documentation plays a vital role in risk-based testing. Clear and comprehensive documentation of Risk Assessments, Prioritization, and Test Plans provides transparency and accountability throughout the testing process.

Regression Testing becomes especially important in risk-based testing. As new risks are identified and mitigated, regression testing ensures that previously tested areas remain stable.

The adaptability of the testing approach is key. It should be able to accommodate Changing Project Circumstances and Priorities, as new risks may emerge or the risk landscape may evolve over time.

Finally, alongside testing, it’s essential to have in place Risk Mitigation Strategies. These strategies could involve risk avoidance, risk acceptance, or detailed risk mitigation plans to address high-priority risks effectively.

Functional Testing Interview Questions for Experienced

Explain Equivalence Partitioning

Equivalence partitioning is a technique that categorizes input data into groups, reducing the number of test cases needed while still ensuring comprehensive test coverage. The primary goal of equivalence partitioning is to ensure comprehensive test coverage while avoiding redundant and unnecessary test cases. Here’s a concise explanation of this technique:

Imagine you have a software application that takes numerical input for a specific field, such as age. Equivalence partitioning would involve dividing the possible input values into groups or partitions based on their equivalence, meaning that input values within the same partition are expected to behave similarly in the software. Here’s how equivalence partitioning works:

Identify Input Ranges: Start by identifying the input ranges or domains. In the case of age, you might have input values ranging from 1 to 100.

Divide into Equivalence Classes: Divide these input values into equivalence classes or partitions. For example, you could create the following partitions:

  • Partition 1: Age values less than 18 (considered minors).
  • Partition 2: Age values between 18 and 65 (considered adults).
  • Partition 3: Age values greater than or equal to 65 (considered seniors).

Select Test Cases: Now, instead of testing every possible age value from 1 to 100, you only need to select test cases from each equivalence class. For instance:

  • Test Case 1: Age = 15 (from Partition 1)
  • Test Case 2: Age = 35 (from Partition 2)
  • Test Case 3: Age = 70 (from Partition 3)

Expected Behavior: You can expect that the software should behave consistently within each equivalence class. For example, for Partition 1, the software should handle minor age inputs appropriately, while for Partition 2, it should handle adult age inputs correctly.

By using equivalence partitioning, you efficiently cover a wide range of potential inputs without the need to test every single value. This technique helps you uncover defects or issues related to how the software handles input data while minimizing redundancy in your test cases.

Equivalence partitioning is particularly valuable when dealing with large input domains, such as dates, currency values, or user IDs, where testing every possible input value would be impractical. It ensures that the most critical scenarios are tested, enhancing the overall efficiency of the testing process.

What is Boundary Value Analysis?

Boundary Value Analysis (BVA) is a software testing technique that focuses on testing values at the boundaries or limits of input domains. It’s based on the observation that many defects in software systems occur near the edges of valid input ranges or at the boundaries between different equivalence classes. BVA is especially valuable in uncovering errors related to data validation and handling.

Here’s a concise explanation of Boundary Value Analysis:

Identify Input Ranges: Begin by identifying the valid input ranges or domains for a particular input field or parameter in the software. For example, if you’re testing a field that accepts positive integers from 1 to 100, the input domain is 1 to 100.

Select Boundary Values: In BVA, you focus on the boundary values of the input domain. These include the minimum and maximum values within the range and values immediately adjacent to them. For the example above, the boundary values would be 1, 100, 2 (just above the minimum), and 99 (just below the maximum).

Test Boundary Values: Create test cases using these boundary values. For the example:

  • Test Case 1: Input = 1 (minimum value)
  • Test Case 2: Input = 100 (maximum value)
  • Test Case 3: Input = 2 (just above the minimum)
  • Test Case 4: Input = 99 (just below the maximum)

Expected Behavior: The goal is to verify that the software handles these boundary values correctly. In this case, you want to ensure that it accepts values within the specified range (1 to 100) and rejects values outside that range. Additionally, you check that the software behaves appropriately at the extremes (minimum and maximum).

BVA helps uncover defects that might occur due to off-by-one errors, incorrect comparisons, or boundary-related issues in the software’s logic. It ensures that the software behaves as expected at the critical points of input domains, where errors are more likely to occur.

This technique is particularly useful in scenarios where precise data validation and handling are essential, such as financial applications, where incorrect calculations or data truncation can have significant consequences.

State Difference between Functional and Structural Testing

Functional testing validates functionality, while structural testing examines the internal implementation of the application, including code and architecture. 

AspectFunctional TestingStructural Testing
FocusEvaluates external behavior and features.Examines internal code structure and logic.
ViewpointAssesses software from a user perspective.Analyzes software at the code and algorithm level.
Test BasisBased on requirements and specifications.Requires knowledge of the software’s internal structure.
ExamplesUnit testing, system testing, user acceptance testing and integration testing.Unit testing (for code paths), code coverage analysis, and control flow testing.

What is UFT (Unified Functional Testing)?

Unified Functional Testing (UFT), formerly known as QuickTest Professional (QTP), is a comprehensive software testing tool developed by Micro Focus. UFT is designed to automate testing for desktop, mobile, and API-based applications. It is widely used by software testing professionals and quality assurance teams to enhance the efficiency and effectiveness of their testing efforts.

What is Data-Driven Testing?

Data-driven testing involves executing the same test script with multiple data sets to ensure diverse scenarios are covered. 

The primary goal of data-driven testing is to validate that a software application behaves correctly and consistently across various input values. In data-driven testing, a test script or scenario is designed to accept input data from external sources, such as spreadsheets, databases, or text files. The test script remains the same, but the data used in the test varies. The data is fed into the test script, and the script is executed for each set of input data.


Let’s consider a simple example of a login page for a web application. The goal is to test the login functionality with various username and password combinations to ensure that it works correctly for different user credentials.

Test Script: The test script for the login functionality is created. It includes steps to open the login page, enter a username and password, click the “Login” button, and verify the expected outcome (e.g., successful login or error message).

Data Preparation: Test data is prepared in an external data source, such as a spreadsheet. The data might look like this:


Data-Driven Execution: The test script is configured to read data from the data source and execute the login test for each row of data. Here’s how the test execution would look:

  • Test Case 1: Use “user1” as the username and “pass1” as the password. Verify successful login.
  • Test Case 2: Use “user2” as the username and “pass2” as the password. Verify successful login.
  • Test Case 3: Use “invalidUser” as the username and “wrongPass” as the password. Verify an error message is displayed.
  • Test Case 4: Use “user3” as the username and “pass3” as the password. Verify successful login.


The test execution results are recorded. This includes whether each test case passed or failed and any additional information or error messages captured during the test.

Benefits of Data-Driven Testing:

  • Efficiency: Reduces the need to create separate test cases for each data combination.
  • Coverage: Ensures that the software is tested with a wide range of input values.
  • Reusability: The same test script can be reused with different datasets.
  • Maintainability: Easy to update or add new test data without modifying the test script.

Data-driven testing is commonly used for scenarios like form submissions, data validation, and parameterized testing, where input data plays a crucial role in determining test outcomes.

Explain Smoke Testing and Sanity Testing

Smoke testing verifies basic functionalities after a build, while sanity testing validates specific functionalities after changes are made. Smoke testing checks if the cake is burnt immediately after baking. Sanity testing ensures the cake’s decorations look perfect.

Smoke Testing:

  • Purpose: Smoke testing, also known as “build verification testing,” aims to ensure that the essential functionalities of the software or application are working correctly and that it is stable enough for further testing. The goal is to detect critical issues that could hinder further testing.
  • Scope: Smoke tests cover the most crucial and basic features of the application. These tests are typically part of an automated or scripted test suite and focus on core functionalities.
  • Execution Time: Smoke testing is executed after a new build or version of the software is deployed but before more comprehensive testing phases. It is a preliminary check and should not be time-consuming.
  • Outcome: If the application passes the smoke test, it signifies that it’s stable enough to proceed with more extensive testing, such as regression testing, functional testing, and other testing phases. If it fails, it indicates significant issues that need immediate attention.

Sanity Testing:

  • Purpose: Sanity testing, also known as “narrow regression testing,” is performed to verify that specific modifications or fixes in the codebase have not adversely affected the existing functionalities of the application. It focuses on specific areas of the application that were changed or areas directly related to those changes.
  • Scope: Sanity tests are narrow in scope and target specific features or modules that have undergone recent changes. They are not intended to provide exhaustive coverage but rather to validate that the recent code changes did not break existing functionality.
  • Execution Time: Sanity testing is executed after code changes, enhancements, or bug fixes have been implemented and retested. It helps ensure that the software is still working as expected after the modifications.
  • Outcome: If sanity testing reveals no issues with the modified or impacted areas, it confirms that the changes did not introduce regression defects. If issues are identified, it indicates that further investigation and fixes are needed.

Key Differences:

  • Scope: Smoke testing verifies basic application stability, while sanity testing focuses on specific, recently modified areas.
  • Purpose: Smoke testing checks overall readiness for testing, while sanity testing confirms that specific changes haven’t adversely affected existing functionality.
  • Execution Time: Smoke testing occurs before further testing phases, while sanity testing occurs after specific changes are implemented.

What is RTM (Requirement Traceability Matrix)?

RTM is a document that connects project requirements to corresponding test cases, ensuring complete test coverage. Think of RTM as a master recipe, detailing all ingredients used – ensuring nothing is missing from your dish.

A Requirement Traceability Matrix (RTM) is a document used to maintain a clear link between the project’s requirements and the various stages of its development and testing lifecycle. It is essentially a table that maps each requirement to the corresponding design, development, and testing activities. In an RTM:

  • Requirements are listed in one column. Other columns represent various phases of the project, such as design, development, and testing.
  • Each cell in the matrix indicates whether a requirement is associated with or addressed in a particular phase. Common symbols or statuses like “Yes,” “No,” “In Progress,” or “Tested” are used to denote the relationship or status of each requirement in each phase.

The RTM serves as a valuable tool for project management, quality assurance, and testing teams. It provides transparency, helps track progress, and ensures that all project requirements are thoroughly tested and validated. When discrepancies or gaps are identified in the matrix, they can be addressed promptly to maintain the project’s alignment with its original requirements.

Why is RTM (Requirement Traceability Matrix) Important?

RTM ensures that all requirements are tested and that no functionality is missed during testing. It provides a roadmap for testing. RTM ensures all required ingredients are in place before you start cooking – no missing spices!

A Requirement Traceability Matrix (RTM) is important in software development and testing for several key reasons:

  • Requirement Alignment: It ensures that project requirements align with the design, development, and testing activities. By mapping requirements to specific phases, it helps maintain the project’s focus on meeting customer needs and project objectives.
  • Completeness Check: RTM serves as a checklist to verify that all specified requirements have been addressed. It helps identify any gaps or omissions in the requirements documentation, ensuring that nothing is missed during development and testing.
  • Change Management: When requirements change or evolve throughout a project, the RTM helps assess the impact of these changes. It allows project stakeholders to see how modifications affect various phases and adjust their plans accordingly.
  • Risk Mitigation: By tracing requirements through different phases, the RTM helps identify potential risks early in the development process. It allows project managers and testers to focus their efforts on high-priority areas, reducing the likelihood of critical issues going unnoticed.
  • Test Coverage: For testing teams, the RTM provides a clear understanding of which requirements need to be tested and to what extent. It ensures that test cases are designed to cover all necessary scenarios and that there is no redundancy in testing efforts.
  • Validation and Verification: The RTM facilitates the validation and verification of requirements. It enables testers to confirm that each requirement has been correctly implemented and that the implemented functionality aligns with the original specifications.
  • Reporting and Documentation: RTM serves as documentation that can be shared with stakeholders, auditors, and regulatory bodies to demonstrate compliance with requirements. It provides a transparent record of how each requirement has been addressed throughout the project.
  • Efficiency and Accountability: It enhances efficiency by streamlining communication and reducing misunderstandings between different project teams. Each team can see their responsibilities and accountabilities about the requirements.
  • Quality Assurance: By ensuring comprehensive requirement coverage and traceability, RTM contributes to the overall quality of the software product. It helps deliver a product that meets or exceeds customer expectations.
  • Project Control: RTM provides project managers with a tool for monitoring progress. It allows them to track which requirements have been addressed and which are pending, enabling better project control and resource allocation.

Difference between Retesting and Regression Testing?

Retesting verifies if a specific defect has been fixed, while regression testing prevents new changes from affecting existing functionalities. Retesting is like tasting a dish again to ensure the issue is resolved. Regression testing checks if changing an ingredient affects the overall taste.

AspectRetestingRegression Testing
PurposeTo verify that a specific defect or issue has been fixed in the latest code changes.To ensure that recent code changes have not adversely affected existing functionality.
ScopeLimited in scope, focusing on the specific defect or issue that was fixed.Broader in scope, covering various areas of the application to detect regressions.
Test CasesReuses the same test cases that initially revealed the defect.Uses a set of test cases that cover a range of application areas, including previously unaffected parts.
TimingPerformed after the defect is fixed and before the code is released or integrated.Conducted as a part of the testing process whenever code changes are made, often during regression testing cycles.
ObjectiveTo confirm that the defect is indeed fixed and no longer exists in the updated code.To verify that existing functionalities remain intact and unaffected by recent code modifications.
Execution FrequencyTypically executed once for each specific defect or issue.Can be executed multiple times throughout the software development lifecycle, especially during integration and regression testing phases.
Test DataUses the same data that initially exposed the defect.May require a broader range of test data to ensure that various scenarios are covered.
Defect FocusFocused on a specific defect, usually documented in the defect tracking system.Concerned with identifying any unintended side effects or regressions across the entire application.

What is Defect Severity and Defect Priority?

Defect priority determines how soon you need to address it. Defect severity reflects the impact of a defect, while defect priority determines its urgency in the development cycle. Defect severity indicates the seriousness of a mistake in the dish – using salt instead of sugar, for example.

AspectDefect SeverityDefect Priority
DefinitionThe seriousness of a defect’s impact on software functionality and performance.The urgency of fixing a defect based on project and business considerations.
PurposeHelps in prioritizing defects based on their potential harm and user impact.Aids in determining the order in which defects should be addressed within the project context.
CategoriesTypically includes levels like critical, high, medium, and low, with critical defects being the most severe.Commonly categorized as immediate, high, normal, and low, with immediate priority given to critical, time-sensitive issues.
ExamplesCritical defects may cause system crashes or data loss.Immediate-priority defects require immediate resolution, often due to impending release deadlines.
ResolutionHigher-severity defects typically receive greater attention and are resolved with urgency.Higher-priority defects are addressed promptly to align with project schedules and stakeholder needs.

What is Accessibility Testing?

Accessibility testing ensures that an application is usable by people with disabilities, conforming to accessibility standards. Accessibility testing ensures everyone can enjoy your dish, regardless of dietary preferences – catering to different dietary needs.

The goal of accessibility testing is to identify and rectify any barriers or obstacles that might prevent people with disabilities from using and interacting with digital content effectively. It promotes inclusive design and compliance with accessibility standards and guidelines.

Here are key aspects of accessibility testing:

Diverse User Base: Accessibility testing considers the needs of users with various disabilities, including visual, auditory, motor, cognitive, and speech impairments. It also caters to different assistive technologies, such as screen readers, voice recognition software, and alternative input devices.

Compliance with Standards: Accessibility testing ensures that digital products adhere to established accessibility standards and guidelines.

Functional and Usability Testing: It covers both functional testing (ensuring all interactive elements work with assistive technologies) and usability testing (evaluating the user experience for people with disabilities).

Testing Scenarios: Accessibility testing involves a range of test scenarios, including keyboard-only navigation, screen reader compatibility, color contrast checks, and testing with alternative input methods.

Benefits: Ensuring accessibility not only enhances the user experience for individuals with disabilities but also aligns with legal requirements in many regions and can expand a product’s user base. Examples of accessibility issues that may be identified during testing include missing alternative text for images, insufficient color contrast, keyboard navigation difficulties, and improper labeling of form fields.

What is Build Acceptance Testing?

Build acceptance testing verifies if a build is stable enough for further testing or deployment. 

The primary aim of Build Acceptance Testing is to identify critical defects, issues, or anomalies in the software build promptly. By doing so, it ensures that only stable and reliable builds move forward in the development process, reducing the risk of delivering a flawed product to users.

During this phase, testers meticulously examine the software build, concentrating on fundamental functionalities and core features. They refer to a set of predefined acceptance criteria, which are established in advance to determine whether the build aligns with the project’s quality standards. 

Automation tools may be leveraged to expedite the testing process, particularly for repetitive and critical test scenarios. Automated tests help ensure a thorough assessment of the build’s stability within a short time frame. Any critical defects or issues discovered during Build Acceptance Testing are immediately reported to the development team. This swift feedback loop facilitates timely resolution, preventing the propagation of severe issues to subsequent stages of testing or production environments.

Build Acceptance Testing also serves as a gatekeeper for the development process. Based on the results of this testing phase, a decision is made on whether the build is acceptable for further testing phases, such as integration testing or user acceptance testing. If significant defects are uncovered, the build may be rejected and sent back to development for fixes. Additionally, a subset of regression test cases may be included in the testing suite to ensure that recent code changes have not inadvertently introduced unexpected regressions.


As the software industry continues to evolve, functional testing remains a critical aspect of software development. By mastering these top 25 functional testing interview questions, you’ll be well-equipped to demonstrate your expertise in interviews and discussions. Whether you’re just starting your journey in testing or have years of experience, staying updated on the latest concepts and techniques will undoubtedly contribute to your success in the field.

Remember, each question covered here serves as a stepping stone to a deeper understanding of functional testing, making you a more valuable asset to any team or project. 

To further explore automated functional testing solutions and enhance your testing skills, you can visit Testsigma’s resources, such as their blogs on different testing types, automated functional testing, and more. Your journey to becoming a functional testing expert starts here!

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