Regression Testing:

Regression testing is used to uncover regression bugs which occur when software functionality stops working or fails to work in its planned format. Typically regression bugs occur due to the unintended consequences of program changes.

Regression testing can be performed at three levels; business process levels, profile levels and/or interface levels. The key to success in automation testing is the clear definition of goals so that it is possible to identify what needs to be automated. Based on the complexity of the test case functional experts might be used in order to verify or test typical business processes.