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Regression testing is a critical part of any integration testing procedure because you want to verify that the change made did not introduce some unexpected effect. Regression testing, then, is the verification that things still work, and implementation testing is verification that new things work.

In the worst case, regression testing might require a full blown acceptance test, and that might take much longer to do than the testing for the one or two lines of code that you changed. Modularization, good design, and good record keeping can minimize regression testing because you might be able to argue that certain things don't need to be retested in one area if you changed something in another area.

You can also argue for minimization of regression testing if you have robust code controls in place. Most large shops will have an automated compilation sequence based on submittal of controlled changes to code. You never want to make a production change on the fly, unless it is an emergency.

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