Purpose
Defects Average Lifetime (all priorities) shows how much time on average a defect spends in a development cycle.
How metric helps
Defects Average Lifetime (all priorities) helps to monitor, analyze and improve a defect processing flow in a project. It's suggested not to keep a defect open for more than 30 days. It may cause a user's satisfaction decrease and an application overall quality and stability.
How metric works
Chart overview
Chart shows a number of days it usually takes for a defect to be fixed - number in the center. Target value is above the chart.
By click on a chart a pop up appears with the following information got from the task tracking system:
Issue ID
Type
Priority
Summary
Calculation
Defects Average Lifetime (all priorities) = (number of days defects were in not "Done" status/ number of all defects).
RAG thresholds: Red - metric value > 30; Green - metric value = < 30.
Assumptions
1 Calculation considers closed items within the last 90 days.
2 Defect is an item of a type set in Project Configuration > Data Sources > Task Tracking System> Quality Management > Issue/Work Item type used for defects tracking.
3 "Done" status is a status from "Done" bucket in Project Settings>Data Sources>Task Tracking System>Workflows.
Data Source
Data for the metric can be collected from a task tracking system (Jira, TFS, Rally, etc.).
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