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There is usually not enough time to do all software testing you want, so you must prioritize. Prioritize tests so that whenever you stop testing you have done the best testing in the time available.
You should use the ranking criteria used to prioritize: • • • • • • • • • •
Severity The priorities of the requirements to be tested Probability Customer’s needs Complexity Changes Technical criticality Visibility of failure Errors Business criticality
Evaluating the quantity and severity of undetected defects allows informed decisions on whether the quality is acceptable or additional testing is profitable.
(c) QATestLab, 2011