Summary:The goal of this paper is to discuss the levels of our test efforts and bug regression and their outcomes within the span of a project. Developers are better at unit testing as they are closely familiar with the code and testers at system testing as they are better at designing the test settings. Test settings are usually custom designed and fairly unique from place to place. In this paper, the author limits the discussion's specifics to his company's design.
White Paper: A Discussion on Testing Levels & Bug Regression