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 > Defenition Definition of Work Buckets > Defects

3 "Done" status is a status from "Done" bucket in Project Settings>Data Sources>Task Tracking System>Workflows.

4 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.