You are a process improver and have decided to use the data from the defect...

Comprehensive and Detailed Explanation From Exact Extract of ISTQB Certified Tester Advanced Level – Test Manager v3.0 syllabus:

Forprocess improvement and root-cause analysis, the syllabus highlights the value ofdefect origin and detection phase datato evaluatewhere defects are injected and where they are detected, calculate removal effectiveness, and focus improvements (e.g., earlier-phase prevention or reviews). Thelifecycle phase detectedenables meaningful analysis ofphase containment, trends, and improvement targets; the other fields are useful operationally but less pivotal fororganizational/process improvement analytics(Chapter 2: Test Management in the Organization – improvement approaches using defect data; Chapter 5: Reporting and analysis of defect trends).