Reliability growth models for quality management
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Transcript of Reliability growth models for quality management
Software Quality ManagementU IVUnit – IV
Roy Antony Arnold Gy yAsst. Prof. / CSE
• Alth h li bilit th d l t• Although reliability growth models are meantfor reliability assessment, they are alsouseful for quality management at theuseful for quality management at theback end of the development process.
• Models developed from a previous product or Models developed from a previous product or a previous release of the same product can be used to track the testing defects of the
dcurrent product.• To have significant improvement, the defect
i l t ( f il d i ) f h arrival rate (or failure density) of the current project must fall below the model curvecurve.
• The QIP involved five extra activities:• The QIP involved five extra activities:1. Blitz testing — "artistic" testing in stressfulenvironments.
2. Customer evaluation — customers conductingtesting in the development laboratory.
3 Code inspections additional inspections of3. Code inspections — additional inspections oferror-prone modules, especially routines that aredifficult to test such as the error
/ ti h dli tirecovery/exception handling routines.4. Design reviews — re-review of designs of suspectcomponents and modules.p
5. Extension of system test — improvement of testsuites and extension of testing schedules to allowthorough final test execution.thorough final test execution.
• Because of the special QIP activities, theproduct ship date was delayed onep p ymonth.
• As a result more than 250 field defects• As a result, more than 250 field defectswere found and removed.
• The field quality of the product, evidencedby field defect arrivals reported in latery pyears, improved significantly.