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Quality Assurance Metrics

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Defect Density

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Measures the number of defects per unit size of the software (e.g., per KLOC - thousand lines of code) and is used to assess the quality of a software product.

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Test Case Effectiveness

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Measures the percentage of identified defects vs the total number of defects, to evaluate how effectively tests can discover defects.

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Test Coverage

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Assesses the proportion of the software that is exercised by the tests and is used to ensure that most paths are tested.

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Mean Time Between Failures (MTBF)

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Quantifies the average time interval between inherent failures of a system during operation, used to measure reliability.

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Mean Time To Repair (MTTR)

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Indicates the average time required to repair a failed component or system, used as a measure of maintainability.

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Bug Triage Time

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Measures how quickly a team can assess and prioritize bugs, reflecting on the responsiveness of the quality assurance process.

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Customer Satisfaction Score (CSAT)

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Measures customer satisfaction with a product or service, typically through surveys, and is a direct reflection of quality perception.

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Requirement Stability Index (RSI)

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Calculates the ratio of requirement changes to the total number of initial requirements, indicating the stability of project requirements.

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Escaped Defects

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Tracks the number of defects that were not caught during testing but were found after release, used to assess the effectiveness of the QA process.

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Test Execution Rate

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Measures the speed at which test cases are executed, not necessarily related to the effectiveness but to the efficiency of testing.

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Code Churn

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Measures the amount of code changes over time, which can help in understanding the stability of a codebase and the pace of development.

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Defect Resolution Time

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Reflects the average time taken to fix a defect after it's reported, an indicator of the team's responsiveness and process efficiency.

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Cycle Time

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Expresses the total time from when work begins to when it is delivered, used to measure the efficiency of the development process.

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Post-release Defects

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Counts the number of defects discovered by users after the product has been released, highlighting the effectiveness of the prior testing.

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Build Stability

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Measures how often the software build fails and requires fixing, indicating the robustness of the code integration process.

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Release Burndown

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Tracks the remaining amount of work versus time until a release, helping to estimate if the team will complete their work in the intended timeframe.

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Automated Test Pass Rate

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Indicates the percentage of automated tests that pass during the development cycle, used to evaluate the stability of the codebase.

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Failed Deployments

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Counts the number of deployment attempts that have resulted in failures, reflecting the effectiveness of deployment strategies.

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Test Automation Coverage

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Measures the extent to which tests are automated, highlighting the efficiency of the QA process and potential for human error reduction.

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Change Failure Rate

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The percentage of changes to the codebase that lead to degraded service or subsequently require remediation, indicating the impact of recent changes.

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