Availability (percentage of time a system is available, versus the time the system is needed to be available)
Mean time between failure (MTBF)
Mean time to repair (MTTR)
Reliability ratio (MTBF / MTTR)
Number of product recalls or fix releases
Number of production re-runs as a ratio of production runs
Costs of reviews, inspections and preventive measures
Costs of test planning and preparation
Costs of test execution, defect tracking, version and change control
Costs of diagnostics, debugging and fixing
Costs of tools and tool support
Costs of test case library maintenance
Costs of testing & QA education associated with the product
Costs of monitoring and oversight by the QA organization (if separate from the development and test organizations)
Breadth of functional coverage
Percentage of paths, branches or conditions that were actually tested
Percentage by criticality level: perceived level of risk of paths
The ratio of the number of detected faults to the number of predicted faults.
Number of post-release defects (found by clients in field operation), categorized by level of severity
Ratio of defects found internally prior to release (via inspections and testing), as a percentage of all defects
All defects include defects found internally plus externally (by customers) in the first year after product delivery
Ratio of maintenance fixes (to repair the system and bring it into compliance with specifications), vs. enhancement requests (requests by users to enhance or change functionality)
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