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Selected:ARID (Active Reviews for Intermediate Designs)A3 Problem Solving MVP Test Matrix Fake Door Test

Criterion	Architecture ARID (Active Reviews for Intermediate Designs)	Operations A3 Problem Solving	Product Discovery MVP Test Matrix	Product Discovery Fake Door Test
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 complex deviation with several people involved, the method bundles problem, analysis, and decision onto one page. It creates a shared working space where causes, countermeasures, and follow-up fit together.	When several minimal variants compete to answer the same question, it makes comparing and choosing between them cleaner. It separates problem, assumption, solution, and evidence. The result is captured as a Test Matrix and a Test Plan.	When demand is still unclear, it measures interest in a feature before it is built. It separates real behavior from polite agreement and deliberately keeps build effort small.
Complexitysame	Medium	Medium	Medium	Medium
Timedifferent	2–4 h review as a planning range; preparation and evaluation additional	45-90 min	45-75 min	1-5 Tage
Participantsdifferent	Designers, developers as users, and facilitation	2-5	2-8	Nutzertraffic
Formatdifferent	Workshop + async	Workshop + async	Workshop	Async
Outputdifferent	Prioritized development tasks, Jointly produced code or pseudocode, Observed difficulties and open design questions, Proposed design revisions	A3 Report, Action Plan, Root Cause Analysis	Test Matrix, Test Plan	Click Data, Interest Signal, Learning Decision
Tagsno overlap	ArchitectureEngineeringFeedbackValidationTasks	LeanProblem solvingCoachingOperations	ExperimentsValidationDiscoveryOptions	ValidationExperimentsDemandDiscovery

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