This technique checks all the test cases on the current program to check its integrity and validate the adverse impact of bug resolving process on another sectionsections. Though it is expensive as it needs to re-run all the cases, it ensures that there are no errors because of the modified code.<ref name=":0">{{Cite conference|date=2008-03-29|title=Understanding Regression Testing Techniques|first1=Gaurav|last1=Duggal|first2=Bharti|last2=Suri|conference=National Conference on Challenges and Opportunities|___location=Mandi Gobindgarh, Punjab, India|citeseerx=10.1.1.460.5875}}</ref>
