Which of the following is used for high-level or comprehensive analysis, as well as for root cause analysis?

Assumptions analysis focuses narrowly on testing the validity of project assumptions to surface risks, not on broad or comprehensive analysis across all risk areas.

The Delphi method is an anonymous iterative expert-consensus technique used to gather and converge expert opinions, not a structured tool for comprehensive or root cause analysis.

Brainstorming is an informal group idea-generation technique that surfaces potential risks quickly but lacks the historical structure needed for comprehensive or root cause analysis.

Checklist analysis uses historical information and lessons learned from previous similar projects to provide a high-level, comprehensive review of potential risks. Because it organizes known risk categories in a structured format, it also supports root cause analysis by allowing analysts to trace observed problems back through documented historical causes and contributing factors.