Purpose

Defects Average Lifetime (top priorities) shows how much time on average a defect of a top priority spends in a development cycle.

How metric helps

Defects Average Lifetime (top priorities) helps to monitor, analyze and improve a defect processing flow in a project. It's suggested to take top priority defects into work as soon as possible to ensure a user's satisfaction and an application overall quality and stability.

How metric works

Chart overview

Chart shows a number of days it usually takes for a top priority 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 top priority 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> Scope Management > Definition of Work Buckets > Defects.

3 Invalid defects are excluded from the calculation. Invalid defect is that conforms to Project Settings ->Data Sources ->Task Tracking System ->Quality Management ->Criteria for invalid defects.

4 Top priority defect is a defect of a priority defined in Project Settings > Data Sources >Task Tracking System > Quality management.

5 "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.).