The objective of applying various testing methodologies in your testing process is to make sure the application can successfully perform and deliver as expected and in various environments and across multiple platforms. Software Testing Methodologies: Learn QA Models Waterfall Model. In the waterfall model, software development progress through various phases like Requirements... Iterative development. Functional Testing is a testing technique that is used to test the features/functionality of the system or Software, should cover all the scenarios including failure paths and boundary cases. FUNCTIONAL TESTING is a type of software testing that validates the software system against the functional requirements/specifications. The purpose of Functional tests is to test each function of the software application, by providing appropriate input, verifying the output against the Functional requirements. Quick Summary :-Since, functional testing tests various aspects of a software product, the types of testing that are performed under this methodology of software testing are numerous.This blog explains every functional type and when it should be performed during the software development cycle. Functional testing involves verifying if all the business requirements are being fulfilled by the application without any error. What is Functional Testing?