Q: What is functional testing?
A: Functional testing is black-box type of testing geared to functional requirements of an application. Test engineers *should* perform functional testing.
Q: What is usability testing?
A: Usability testing is testing for 'user-friendliness'. Clearly this is subjective and depends on the targeted end-user or customer. User interviews, surveys, video recording of user sessions and other techniques can be used. Programmers and developers are usually not appropriate as usability testers.
Q: What is incremental integration testing?
A: Incremental integration testing is continuous testing of an application as new functionality is recommended. This may require that various aspects of an application's functionality are independent enough to work separately, before all parts of the program are completed, or that test drivers are developed as needed.
Incremental testing may be performed by programmers, software engineers, or test engineers.
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