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Selected:ARID (Active Reviews for Intermediate Designs)Barrier Analysis Root Cause Tree Analysis 5 Whys

Criterion	Architecture ARID (Active Reviews for Intermediate Designs)	Operations Barrier Analysis	Operations Root Cause Tree Analysis	Operations 5 Whys
Purposedifferent	ARID examines how well developers can work with a technical design. It focuses on a part of the system that can still be revised, between the architecture overview and the detailed specification.	For a risk that can only be managed through multiple layers of protection, the method examines the effectiveness of each barrier. It shows where safeguards are missing, too weak, or fail under real conditions.	For a problem with several suspected causes, the method builds a causal structure instead of a mere list. It makes visible how causes connect and where the strongest points of leverage lie.	For a single, hard-to-explain deviation, the method exposes the causal chain behind the visible symptom. It keeps the cause open until a controllable condition emerges instead of a mere description.
Complexitydifferent	Medium	Medium	Medium	Low
Timedifferent	2–4 h review as a planning range; preparation and evaluation additional	2-4 h	1-3 h	15-30 min
Participantsdifferent	Designers, developers as users, and facilitation	2-6	2-8	2-6
Formatdifferent	Workshop + async	Workshop + async	Workshop	Workshop
Outputdifferent	Prioritized development tasks, Jointly produced code or pseudocode, Observed difficulties and open design questions, Proposed design revisions	Barrier Inventory, Failure Analysis per Barrier, Action Backlog	Cause Tree, Evidence Notes, Countermeasures	Root cause notes, Countermeasures
Tagsno overlap	ArchitectureEngineeringFeedbackValidationTasks	Root causeSafetyIncident	Root causeTreeIncidentQuality	Root causeIncidentLeanProblem solving

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