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- Path: sparky!uunet!ukma!usenet.ins.cwru.edu!icd.ab.com!iccgcc.decnet.ab.com!kambic
- From: kambic@iccgcc.decnet.ab.com (Bonus, Iniquus, Celer - Delegitus Duo)
- Newsgroups: comp.software-eng
- Subject: Re: Defect Costs
- Message-ID: <1992Nov9.114000.9286@iccgcc.decnet.ab.com>
- Date: 9 Nov 92 11:40:00 EST
- References: <prspool.721000280@terra>
- Lines: 34
-
- 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.
-
- But he did keep track of the total rework costs, cost of quality, which
- continued to go down. My suspicions are that once the cost of quality begins
- to level out, they will go for more detailed causal analysis, which may break
- out what you ask for.
- >
- > I would be interested in hearing from others with information from
- > similar studies.
- >
-
- Only have internal (confidential), but Dion's talk was excellent.
-
- George Kambic
- sd
-
-