Functional System Testing Techniques

There are several techniques for software testers to test the functionality and features of the software. Each of these techniques cater to various requirements of the client and ensure that the end product is developed to fulfil all their software needs. Some of these techniques are:

  1. Requirement Testing: With this technique of functional testing, one can ensure that the system performs correctly and make sure that its correctness is sustained for a considerable period of time. Additionally, with requirements testing, system can be tested for correctness through all phases of SDLC. However, in the case of reliability the programs should be in place to make system operational.
  2. Regression Testing: In regression testing all aspects of system remain functional after testing. Change in one segment does not change the functionality of other segments. Moreover, test cases, which were used previously for the already tested segment are re-run to ensure that the results of all the tested segments are same. Regression testing also verifies that software which was previously developed and tested still performs the same way after it was changed or interfaced with other software.
  3. Error-Handling Testing: Error handing testing determines the ability of applications to process the incorrect transactions properly. It assigns the accountability of processing errors, which enables the procedures to provide a high probability that errors will be properly corrected in the software or its application. During correction process reasonable control is maintained over all defects found in the system.
  4. Manual-Support Testing: It involves testing of all the functions performed by the people while preparing the data and using these data from automated system.
  5. Inter-systems Testing: Application systems are frequently interconnected to other systems, wherein there is an exchange of data. In these types of scenarios, intersystem testing is executed to ensure interconnection between applications and software is functioning correctly and is completed without any hassle.
  6. Control Testing: Control is a management tool, which ensures that processing is performed in accordance to what management desire or intents. Moreover, it looks at the totality of the system and validates its functionality.
  7. Parallel Testing: To ensure that the processing of new application (new version) is consistent with respect to the processing of previous application version, parallel testing is performed on software or applications. It conducts redundant processing, to ensure that the new version or application performs correctly. Moreover, it demonstrates consistency and inconsistency between two versions of the application.

Advantages and Disadvantages of Functional Testing:

Functional Testing is a testing technique that is used to test the features as well as the functionality of the system. Moreover, it covers all the scenarios, such as failure paths and boundary cases. Therefore, functional testing is the best option for testers to check the functionality and performance of the developed software, as it ensures that the system is working as per client’s demand and is providing expected results. Even though there are numerous benefits and advantages of using functional testing, one can still find few drawbacks or disadvantages associated with it. Hence, to provide a better understanding of the functional testing, here are some of its advantages and disadvantages.


  • It simulates actual system usage.
  • Does not make any system structure assumptions.
  • It is more effective when the test conditions are created directly from user or the business requirements.
  • Closely reflects the experience of the users.
  • Tester are able to evaluate individual features of an application.


  • It has a potential of missing logical errors in the software.
  • Functional testing has a high possibility of redundant testing.


Software and applications all over the world are tested thoroughly before they are released in the software industry for the use of the end users. Testing, therefore, not only ensures the quality of the product, but also validates it functionality, features, quality and more. Functional testing is one of the most significant form of testing in Software Development Life Cycle (SDLC) that can be used for testing the features and functionality of the software. Through this testing, testers can check the User Interface, APIs, Database, security, client or server applications and functionality of the application under test. Additionally, functional testing can be done either manually or through automation. Functional testing tests a slice of functionality of the whole system and ensures that it is developed appropriately. Also, with this type of testing one can make sure that the software’s performance at the user end is of superior quality and it is implemented to their system without any hassle.

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