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Criterion
Game Day workspace showing the question, observations, and next decision.
DevOps
Game Day
Paper illustration of a calm four-quadrant Assumption Map with hypothesis cards and emphasis on important assumptions with little evidence.
Product Discovery
Assumption Mapping
Design sheets and interface cards connect to jointly written pseudocode with highlighted unresolved questions.
Architecture
ARID (Active Reviews for Intermediate Designs)
Paper illustration of an assumption matrix with prioritized test cards
Decision Making
Assumption Surfacing
Purposedifferent
In preparing for rare incidents, the method tests response capability under controlled conditions. It shows where assumptions about stability, roles, and recovery are too optimistic.When assumptions still sit unordered in the room, it weighs uncertainty against leverage. It makes visible which hypotheses should be checked first.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.Plans often contain assumptions that were never openly stated and remain dangerous precisely because of that. Assumption Surfacing makes these silent premises visible and prioritizes which of them carry the initiative or could sink it.
Complexitydifferent
HighMediumMediumLow
Timedifferent
Halber Tag45-60 min2–4 h review as a planning range; preparation and evaluation additional45-90 min
Participantsdifferent
5-202-8Designers, developers as users, and facilitation2-8
Formatdifferent
WorkshopWorkshop + asyncWorkshop + asyncWorkshop + async
Outputdifferent
Simulation Notes, Gaps List, Updated RunbooksAssumption map, Test backlog, Risk rankingPrioritized development tasks, Jointly produced code or pseudocode, Observed difficulties and open design questions, Proposed design revisionsAssumption List, Critical Assumptions, Learning Plan
Tagsno overlap
ResilienceOperationsIncident
AssumptionsRiskExperimentsValidation
ArchitectureEngineeringFeedbackValidationTasks
AssumptionsRiskDecisionDiscovery
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