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

Criterion	Operations A3 Problem Solving	Architecture ARID (Active Reviews for Intermediate Designs)	Product Discovery Learning Card	Product Discovery MVP Test Matrix
Purposedifferent	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.	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.	The Learning Card connects traceable test results to a reasoned next action while keeping the limits of the insight visible.	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.
Complexitydifferent	Medium	Medium	Low	Medium
Timedifferent	45-90 min	2–4 h review as a planning range; preparation and evaluation additional	25-40 min	45-75 min
Participantsdifferent	2-5	Designers, developers as users, and facilitation	1-5	2-8
Formatdifferent	Workshop + async	Workshop + async	Workshop + async	Workshop
Outputdifferent	A3 Report, Action Plan, Root Cause Analysis	Prioritized development tasks, Jointly produced code or pseudocode, Observed difficulties and open design questions, Proposed design revisions	Learning Card with evidence and next action	Test Matrix, Test Plan
Tagsno overlap	LeanProblem solvingCoachingOperations	ArchitectureEngineeringFeedbackValidationTasks	ExperimentsValidationDiscoveryLearning	ExperimentsValidationDiscoveryOptions

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