Testing Metrics

Following are the metrics used in testing :  

Number of Defects - The total number of remarks found in a given time period that resulted in software or documentation modifications.  

Turnaround (Response) Time - Turnaround time for defect fixes, by level of severity  

Test coverage - Breadth of functional coverage. Percentage of paths, branches or conditions that were actually tested  

Test case effectiveness - The extent to which test cases are able to find defects  

Cost of defects - Business interruption costs; costs of work-around , Litigation costs resulting from defects , Annual maintenance cost Reliability - Percentage of time a system is available, Mean time between failure (MTBF), Man time to repair (MTTR), Reliability ratio (MTBF / MTTR)

Time to solve a defect - Effort required to resolve a defect (diagnosis and correction) Time to find a defect - The effort required to find a defect.  

Defect removal efficiency - Number of defects found by clients (Post Release) categorized by level of severity , Ratio of defects found in inspections and testing (Prior to Release) , All defects found internally plus externally (by customers) in the first year after product delivery.

Defect severity index - An index representing the average of the severity of the defects