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definition-Remaining-Major-Defects

Definition:

This is an estimate of the Major-Defect density remaining in a specification After SQC has evaluated its Quality.

Alternative Names

Concept Number: *060
English Master: Remaining Major Defects
Synonyms, Variations & Acronyms: none

Detailing

This can be done Before or After removing Defects identified. This can be done based on a Sample.


Illustrations

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Type

Metric


Examples

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Notes

1. The estimate is based on:

• Defects found (using knowledge of % Defect-finding Effectiveness) and
• Defect removal (using knowledge of % Effectiveness of the correction Process).

See Section 8.6 for a worked example.

2. The Defect density is usually expressed as the number of remaining Major-Defects/(logical) page.

3. It is important to understand that we do not know precisely where such Defects are located, and we do not know exactly what they are. This is an estimate of the current total of the Defect Quantity remaining, Before or After editing or Debugging.

4. The estimate seems to be accurate to about plus or minus 30%. In rougher terms, experience shows that for every Defect, which SQC finds and fixes, there is about one more left, which will be discovered by future QC (test, or another SQC) or customer use.

5. The “remaining Defects” estimate is primarily used to make an Exit decision from a test or QC Process. The “remaining Defects estimate” represents calculable future costs. One Major-Defect cured saves about 10 hours downstream with about 25%-35% probability. These downstream costs can be weighed against the Cost of removing Defects immediately, Before proceeding further.

For every Defect you find and fix there remain that many more in the System.


If that doesn't Work for you, try Gerald Weinberg”s Principle:

“There is always one more Bug remaining”(Even After you think you have removed the last Bug).


Keyed-Icons

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Drawn-Icons

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Logical-Page
Quality-Level
Specification-Defect
Major-Defect


History-of-Concept

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This Concept entered by Diane O'Brien.

Created by system. Last Modification: Thursday 11 of July, 2019 20:12:12 CEST by Admin (Kai).

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