From http://www.softwaretestinghelp.com/regression-testing-tools-and-methods/ The selective retesting of a software system that has been modified to ensure that any bugs have been fixed and that no other previously working functions have failed as a result of the reparations and that newly added features have not created problems with previous versions of the software . Also referred to as verification testing , regression testing is initiated after a programmer has attempted to fix a recognized problem or has added source code to a program that may have inadvertently introduced errors. It is a quality control measure to ensure that the newly modified code still complies with its specified requirements and that unmodified code has not been affected by the maintenance activity. What is Regression Software Testing? Regression means retesting the unchanged parts of the application. Test cases are re-execu...