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Criterion
Paper illustration for Fault Isolation.
Engineering
Fault Isolation
Red Teaming method illustration showing its working structure
Decision Making
Red Teaming
Design sheets and interface cards connect to jointly written pseudocode with highlighted unresolved questions.
Architecture
ARID (Active Reviews for Intermediate Designs)
Purposedifferent
In technical failures, the visible symptom often gets mixed up with the actual cause. Fault Isolation narrows the fault space and progressively reduces which part of the system is truly affected.For strategic decisions with high reach, agreement and gut feeling are often not enough. Red teaming brings deliberate opposition into the situation and tests where a plan breaks under real counterarguments.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.
Complexitydifferent
MediumHighMedium
Timedifferent
30-180 min1-4 h2–4 h review as a planning range; preparation and evaluation additional
Participantsdifferent
1-63-8Designers, developers as users, and facilitation
Formatdifferent
Workshop + asyncWorkshopWorkshop + async
Outputdifferent
Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault AreaChallenge Findings, Risk Register, Mitigation PlanPrioritized development tasks, Jointly produced code or pseudocode, Observed difficulties and open design questions, Proposed design revisions
Tagsno overlap
TroubleshootingDiagnosisEngineering
RiskDecisionSensemaking
ArchitectureEngineeringFeedbackValidationTasks
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Often compared together

Methods with strong topical overlap with the current selection, not yet in the comparison.

Paper illustration for Risk Storming.
Architecture
Risk Storming
Paper illustration for Argument Mapping
Decision Making
Argument Mapping
Paper illustration of a calm four-quadrant Assumption Map with hypothesis cards and emphasis on important assumptions with little evidence.
Product Discovery
Assumption Mapping
Paper illustration of an assumption matrix with prioritized test cards
Decision Making
Assumption Surfacing