Regression testing is one of the most frequently used objectives of testing. It focuses on the application retesting after changes are implemented. That changes can be local, - like new features or bug-fixes, or global, - like new business logic implementation.
Development methodology is a framework that is used to structure, plan, and control the development of software systems. Agile and CMMI Waterfall methodologies are very alike and have enough differences to be named differently. Let’s consider the methodologies in detail.