The effectiveness of a development team to capture defects before product
release significantly reduces the total cost of ownership of an application. It is far cheaper to correct a defect before product release.
One simple measurement of this effectiveness is TCE (Total Containment Effectiveness). This is the percentage of defects contained or discovered before a product is released, divided by the total defects both pre and post release. The higher the percentage the more effective a development team is.
preRelease Defects
TCE = ------------------------------------------- * 100%
preRelease + postRelease Defects
To get the postRelease Defect count the application must be used for 6 to 12 months. If you track the version a defect was injected into then you can further extend this analysis while other versions of the application are release. This is helpful in an agile environment where TCE would be more difficult to track because of the number of releases required per cycle.
One simple measurement of this effectiveness is TCE (Total Containment Effectiveness). This is the percentage of defects contained or discovered before a product is released, divided by the total defects both pre and post release. The higher the percentage the more effective a development team is.
preRelease Defects
TCE = ------------------------------------------- * 100%
preRelease + postRelease Defects
To get the postRelease Defect count the application must be used for 6 to 12 months. If you track the version a defect was injected into then you can further extend this analysis while other versions of the application are release. This is helpful in an agile environment where TCE would be more difficult to track because of the number of releases required per cycle.
If you then track the development phase the defect was injected then analysis will lead you to improving the effectiveness of a struggling phase.
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