The software is ready for release when:
1. It has been tested with a test suite that provides 100% functional coverage, 80% branch coverage, and 100% procedure coverage.
2. There are no level 1 or 2 severity defects.
3. The defect finding rate is less than 40 new defects per 1000 hours of testing
4. Stress testing, configuration testing, installation testing, Naïve user testing, usability testing, and sanity testing have been completed.
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References – http://searchwarp.com/swa334239-P2.htm