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Selected:ARID (Active Reviews for Intermediate Designs)Test Card Riskiest Assumption Test Fake Door Test

Criterion	Architecture ARID (Active Reviews for Intermediate Designs)	Product Discovery Test Card	Product Discovery Riskiest Assumption Test	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.	The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success.	When an idea hinges on one critical unknown, it prioritizes testing that exact piece of uncertainty first. It separates problem, assumption, solution, and evidence. The result is captured as a prioritized list of assumptions, a test plan, and a result report.	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.
Complexitydifferent	Medium	Low	Medium	Medium
Timedifferent	2–4 h review as a planning range; preparation and evaluation additional	20-35 min	1-2 Wochen pro Iteration	1-5 Tage
Participantsdifferent	Designers, developers as users, and facilitation	1-5	2-6	Nutzertraffic
Formatdifferent	Workshop + async	Workshop + async	Workshop + async	Async
Outputdifferent	Prioritized development tasks, Jointly produced code or pseudocode, Observed difficulties and open design questions, Proposed design revisions	Test Card with a pre-set threshold	Prioritized Assumption List, Test Plan, Results Report	Click Data, Interest Signal, Learning Decision
Tags1 shared	ArchitectureEngineeringFeedbackValidationTasks	ExperimentsValidationDiscoveryHypothesis	ExperimentsValidationDiscoveryAssumptions	ValidationExperimentsDemandDiscovery

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