Software testing always plays an important role in building reliable applications such as web applications, desktop applications etc. Even though automation testing has grown rapidly, manual testing remains a vital component of quality assurance. Manual testing is very important to understand the functional flow of the validation in all aspects. Without the knowledge of functional flow of the testing, it is very difficult to build the automation scripts by the tester. Manual Testing is still used in many of the software companies. In India, approximately 75% of the companies rely on manual testers in the software industry. In this blog, we will discuss some core manual testing techniques, understand how Boundary Value Analysis and Decision Table Testing work, and reflect on the future of manual testing as artificial intelligence continues to evolve.
Common Manual Testing Techniques
Manual testing involved evaluating the systems actual behavior with the expected behavior without the intervention of any automation tools. Manual testing enhances the creativity, domain knowledge and expertise us to Identify critical bugs as well as minor bug which scripts may miss to identify.
The manual testing techniques is normally classified into two types.
- Functional Testing
- Non-Functional Testing Let us explore one by one below.
Functional Testing:
Functional testing focuses on validating whether each feature of the application works according to the requirements. Functional testing ensures that the core features are reliable and behave consistently. Testers will create the test scenarios and built them into test cases, execute them manually, and capture the test evidence into a documentation for Product owner review.
Examples include:
1.Checking if sign in option is clickable in login page of some website application
2.Verifying forgot password functionality
3.Testing payment through all payment modes etc.,
Functional testing involves the below techniques,
1. Unit Testing:
Unit Testing is basically performed by developer after the deployment of the code. It verifies only the individual components or modules of the code.
2. Integration Testing:
Integration testing is one of the software testing processes. It verifies that different set of components or modules of the application or software is working as expected without any errors or issues. It verifies interactions, communications and data flow between integrated systems which unit testing may miss to test.
3. Regression Testing:
Regression Testing is performed to confirm that the existing feature is not affected after some code changes by the developer. Whenever new features are added, existing functionalities must be checked to ensure they still work correctly. Manual regression testing involves re-running test cases to confirm that recent code changes or any software version upgrade has not introduced new defects. Regression testing is also needed when there is any defect fix occurred to verify the other features are not affected and it is working as expected. It also necessary to perform after the performance issue fix.
4. Retesting:
Retesting is done when the tester logs any bug and the developer fixes the code according to the specific bug. Once after the fix particular functionality is tested again by the tester. If the retesting is also failed again then the tester reopens the bug and assign it back to the developer for fix.
5. Smoke Testing
It is s subset of Acceptance Testing. Tester only tests the major functionality of the software. It is executed before any detailed functional or regression teste are executed
6. Sanity Testing
It is a subset of Regression Testing. Sanity testing is done to verify the minor code changes made after build to fix the bug that does not cause any new issue and older issue works as expected. If Sanity test is failed, then the build is rejected.
Non- Functional Testing:
Non- Functional testing checks the performance, usability, reliability, security and scalability of the system or software. It is performed after functional testing and often required specialized tools. Speed and scalability are the inputs.
Non-Functional testing involves the below techniques,
1. Performance Testing
It measures responsiveness and stability of the system. Load Testing checks behavior under expected user load. Stress Testing evaluates limits under extreme conditions. Volume Testing assesses handling of large data volumes.
2. Security Testing
It validated protection among each system/software
3. Usability Testing
It ensures the application is user friendly.
4. Endurance Testing
It is performed for longer time with heavier load to test the endurance of the system or software.
Boundary Value Analysis (BVA)
Boundary Value Analysis is a technique used to test values at the edges of input ranges. The idea is simple: most defects occur at the boundaries rather than in the middle of a range. By testing these limits, testers can uncover errors that might otherwise go unnoticed.
Why Boundaries Matter
1.Consider a field that accepts ages between 18 and 60. Common mistakes include:
2.Incorrect comparisons
3.Missing equal operators
These defects appear mainly at boundary points.
How BVA Works
Testers identify:
1.Lower boundary
2.Upper boundary
3.Values just inside the boundary
4.Values just outside the boundary
Using the age example (18–60), the key test inputs would be:
17 (just below lower boundary)
18 (lower boundary)
19 (just above lower boundary)
59 (just below upper boundary)
60 (upper boundary)
61 (just above upper boundary)
Benefits of BVA
1.Reduces number of test cases while increasing effectiveness
2.Detects defects early
3.Simple to apply
4.Useful for numeric fields, ranges, and limits
Decision Table Testing
Decision Table Testing is a structured technique used when multiple conditions influence an outcome. Many systems behave differently depending on combinations of inputs. Decision tables help testers ensure all combinations are covered.
Why Use Decision Tables?
Real-world systems often contain:
1.Complex rules
2.Multiple conditions
3.Various outcomes
Decision tables simplify this complexity by organizing conditions and actions in a clear tabular format.
How Decision Table Testing Works
- Imagine an online shopping application with the following rules:
- If the user is a registered member and purchases more than $100, they get a 10% discount.
- If the user is not registered but buys more than $100, they get a 5% discount.
- If the purchase is below $100, there is no discount regardless of membership.
Condition Case 1 Case 2 Case 3 Case 4
Registered Member? Yes Yes No No
Purchase > $100? Yes No Yes No
Expected Discount 10% 0% 5% 0%
The Future of Manual Testing in the Age of AI
With the rise of artificial intelligence, machine learning, and automation tools, many people question whether manual testing will remain relevant. While AI is transforming software quality practices, manual testing is not disappearing, but it is simply evolving.
Manual testers will not be replaced; instead, their roles will shift.
Testers will:
1.Work closely with AI tools
2.Focus more on exploratory and usability testing
3.Design better test scenarios
4.Validate AI's decisions
5.Collaborate with automation teams
Testers who adapt, learn new tools, and understand both manual and automated approaches will remain valuable.
The future of testing will be a hybrid model where AI handles repetitive tasks, and humans focus on strategic, complex, and creative areas of testing. Manual testing will complement AI, not compete with it.
Conclusion:
Manual testing continues to play a critical role in ensuring software quality. Techniques like exploratory testing, usability testing, Boundary Value Analysis, and Decision Table Testing help testers uncover defects effectively and ensure that applications meet user expectations. AI will enhance the work of testers, allowing them to focus on tasks that require deeper thinking. The future belongs to testers who combine human skills with technological tools creating stronger, more reliable software for everyone.
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