Functional Testing Vs Non-Functional Testing


Functional Testing: Testing the application against business requirements. Functional testing is done using the functional specifications provided by the client or by using the design specifications like use cases provided by the design team.
Functional Testing covers:
  • Unit Testing
  • Smoke testing / Sanity testing
  • Integration Testing (Top Down,Bottom up Testing)
  • Interface & Usability Testing
  • System Testing
  • Regression Testing
  • Pre User Acceptance Testing(Alpha & Beta)
  • User Acceptance Testing
  • White Box & Black Box Testing
  • Globalization & LocalizationTesting
Non-Functional Testing: Testing the application against client's and performance requirement. Non-Functioning testing is done based on the requirements and test scenarios defined by the client.
Non-Functional Testing covers:
  • Load and Performance Testing
  • Ergonomics Testing
  • Stress & Volume Testing
  • Compatibility & Migration Testing
  • Data Conversion Testing
  • Security / Penetration Testing
  • Operational Readiness Testing
  • Installation Testing
  • Security Testing (ApplicationSecurity, Network Security, System Security)


  1. good one thanx alot for putting all the testing at one place.

  2. good answer...
    for this answer u can also visit at
    it will definitely help u...

  3. understandable answer

  4. not too good..because here shown only which testing is used or helping with
    functional testing or non funct..tstg.

  5. Usability Testing is non functional testing

  6. very nice... its so easy to understand..
    Thanks a lot..

  7. Non functional testing may be performed at all test levels. The term non-functional testing describes the tests required to measure characteristics of systems and software that can be quantified on a varying scale, such as response times for performance testing.

    Types of Non-functional testing are performance testing, load testing, stress testing, usability testing, maintainability testing, reliability testing and portability testing.
    Source: What is non functional testing

  8. thanq... it shows clear cut differences b/w functional and non functional testing... :) :)

  9. good difference of function testing and non-function testing..........thanks alot

  10. great but it works more to ppl if u give brief of types of both func/non funct testing!!! thanks

  11. How about automation? It is a repeated functional testing. also it is technical testing. Please we need difference between Functional testing and Technical testing not difference between functional and non functional.

  12. Hi thanks for sharing about functional testing keep posting

  13. not that much good...only provided categories with out any description