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- Newsgroups: comp.software-eng
- Path: sparky!uunet!seas.gwu.edu!sr
- From: sr@seas.gwu.edu (Stan Rifkin)
- Subject: Re: Defect Costs
- Message-ID: <1992Nov7.133311.7052@seas.gwu.edu>
- Keywords: cost of quality COQ Dion
- Sender: news@seas.gwu.edu
- Organization: George Washington University
- References: <prspool.721000280@terra>
- Date: Sat, 7 Nov 1992 13:33:11 GMT
- Lines: 42
-
- In article <prspool.721000280@terra> prspool@siemens.com. (Peter Spool) writes:
- >The closest I've seen to a recent assessment of "Defect Costs"
- >was a presentation on the "Cost of Quality" by Ray Dion of the Raytheon
- >Equipment Division. The talk was given at the Software Engineering Symposium
- >in Pittsburgh this past September. He tracked three categories of costs:
- >
- >1. Appraisal Costs: which included Reviews, Walkthroughs, Inspections,
- > Testing (the FIRST time), Independent Verification and Validation
- > (the FIRST time), and Audits.
- >
- >2. Prevention Costs: which included Training, Tools, Mehtodologies,
- > Policies and Procedures, Planning, Data Gathering and Analysis,
- > Quality Improvement Projects, Fault and Root Cause Analysis.
- >
- >3. Cost of Non-Conformance: Re-reviews, Re-tests, Fixing Defects in
- > Code and Documentation, Engineering Changes, and Patches to Delivered Code.
- >
- >Total Cost of Quality = Appraisal Costs + Prevention Costs +
- > Cost of Non-conformance
- >
- >Over a three year period, the Cost of Quality went from about 60% of the
- >total product cost, to about 40%. The savings were about $20 million.
- >
- >Unfortunately, there was no mention during his talk, of the rate of
- >increase in cost to fix defects as time goes on.
- >
- >I would be interested in hearing from others with information from
- >similar studies.
- >
- >
- >Peter R. Spool
- >Siemens Corporate Research
- >Princeton, NJ
- >(609) 734-3385
- >prspool@siemens.com
-
- Ray Dion's work ranks as among the best examples of the application of
- Phil Crosby's cost of quality approach applied to software
- development. He is an inspiration to all of us, and so are his process
- improvement gains. Ray has always been willing to speak about his
- work, so if you have any questions for him you might try calling him
- at 508/440-2236, the last number i have for him.
-