Defect metrics measure faults. There are some defect metrics like defect by action taken, defect by injection phase, defect by detection phase, defect by priority, and defect by category etc. Usually data for these metrics is taken /exported from the defect tracking tool to MS Excel and then viewed by preparing different charts from those data.
Below you can see few of the Defect Metrics:
Defects by Action Taken
(If for example 'Not Fixed' is high then it may be concluded that developers are busy on something else more important or one or two might be on leave. If for example 'Not a Defect' is high, it may mean that a tester has less knowledge on the functionality of the application or module and needs more training etc.)
Defect by Injection Phase
(You can get to know for example which phase of SDLC is/was challenging.)
Defect by Detection Phase
(For example which Process or Phase is well implemented, whether review process is finding more bugs or testing phase is finding more.)
Defects by Priority
(Prioritize defects into High, Medium or Low categories.)
Defects by Category
(It may help different teams to focus on the weak areas for improvement.)
