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Selected:Blameless Postmortem ARID (Active Reviews for Intermediate Designs)Experiment Canvas Test Card

Criterion	DevOps Blameless Postmortem	Architecture ARID (Active Reviews for Intermediate Designs)	Product Discovery Experiment Canvas	Product Discovery Test Card
Purposedifferent	After an incident with damage or a near miss, the method creates a sober field for learning without assigning blame. It directs attention to the course of events, conditions, and effective countermeasures.	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.	When experiments become unreadable after the fact, it arranges hypothesis, signal, and learning goal on a single canvas. It separates problem, assumption, solution, and evidence. The result is captured as a Completed Experiment Canvas and a Success Metric.	The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success.
Complexitydifferent	Medium	Medium	Low	Low
Timedifferent	30-90 min	2–4 h review as a planning range; preparation and evaluation additional	30-60 min	20-35 min
Participantsdifferent	3-12	Designers, developers as users, and facilitation	1-5	1-5
Formatsame	Workshop + async	Workshop + async	Workshop + async	Workshop + async
Outputdifferent	Postmortem Doc, Action Items, Timeline	Prioritized development tasks, Jointly produced code or pseudocode, Observed difficulties and open design questions, Proposed design revisions	Completed Experiment Canvas, Success Metric	Test Card with a pre-set threshold
Tagsno overlap	Site Reliability EngineeringIncidentLearningReliability	ArchitectureEngineeringFeedbackValidationTasks	ExperimentsValidationDiscoveryHypothesis	ExperimentsValidationDiscoveryHypothesis

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