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How does wafer level reliability assessment and testing methodology integrate into the semiconductor manufacturers overall reliability assurance and improvement strategy? What wafer level tests are appropriate and when should they be utilized? Wafer level reliability has made the evolutionary step from academia to manufacturing actuality. This paper provides a conceptual focus for where and when wafer level reliability is utilized in a state-of-the-art semiconductor manufacturing environment. Special emphasis is placed on the use of wafer level reliability testiiig for introducing and qualifying new semiconductor technology, as well as controlling production once the technology has been qualified.