Some Metrics that testers should know

Some important derived metrics that you should know :
· Productivity – unit work completed in unit time
· In-process defect density – number of in-process defects per unit size
· Post-delivery defect density – post delivery defects per unit size
· Cost of quality – percentage of effort spent on activities for ensuring the quality other than development activities inside the project
COQ = (Appraisal Effort + Prevention Effort + Failure Effort) X 100 / (Appraisal Effort + Prevention Effort + Failure Effort + Development Effort)
· Review effectiveness - % of defects from review process out of total defects. Defects from the review of test cases and test application are not considered.
· Testing defect density – number of defects from testing per unit size
· Developer testing effectiveness - % of bugs from developer testing out of total number of bugs (Developer testing + Testing team testing + customer testing)
· Testing effectiveness of Independent Testing Team(ITT) - % of bugs from ITT testing out of bugs from ITT testing and customer.
· Test execution rate – number of test cases executed in unit time
· Schedule variation – deviation of actual schedule from planned schedule expressed as percentage
· Effort variation - deviation of actual effort from planned effort expressed as percentage
· Mean time to Repair (MTTR) – a measure of how fast a customer reported defect is repaired
· Mean Time Between Failure (MTBF) – mean time between two successive failures of the product
· Customer satisfaction index (CSI) – the level of satisfaction of customer