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Selected:Lean Canvas ARID (Active Reviews for Intermediate Designs)A3 Problem Solving Assumption Mapping

Criterion	Product Strategy Lean Canvas	Architecture ARID (Active Reviews for Intermediate Designs)	Operations A3 Problem Solving	Product Discovery Assumption Mapping
Purposedifferent	When an early product bet still has too many open points, it brings target group, problem, and assumptions into a single view. It condenses the idea so core risks become nameable.	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 assumptions still sit unordered in the room, it weighs uncertainty against leverage. It makes visible which hypotheses should be checked first.
Complexitysame	Medium	Medium	Medium	Medium
Timedifferent	45-90 min	2–4 h review as a planning range; preparation and evaluation additional	45-90 min	45-60 min
Participantsdifferent	1-6	Designers, developers as users, and facilitation	2-5	2-8
Formatsame	Workshop + async	Workshop + async	Workshop + async	Workshop + async
Outputdifferent	Lean Canvas, Core Assumptions, Experiment Backlog	Prioritized development tasks, Jointly produced code or pseudocode, Observed difficulties and open design questions, Proposed design revisions	A3 Report, Action Plan, Root Cause Analysis	Assumption map, Test backlog, Risk ranking
Tagsno overlap	StartupLeanAssumptionsBusiness model	ArchitectureEngineeringFeedbackValidationTasks	LeanProblem solvingCoachingOperations	AssumptionsRiskExperimentsValidation

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