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thinking-kepner-tregoe

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Use when a selective defect needs IS/IS-NOT difference analysis or a consequential option choice needs must/want weighting and adverse-consequence comparison.

When to use

• A defect affects some objects, places, times, or cohorts but not comparable others.
• Several candidate causes remain and the contrast boundary can discriminate them.
• A consequential option choice has explicit non-negotiables, competing objectives, and risks that should be compared consistently.

When not to use

• A uniform failure has no meaningful IS-NOT contrast, or the cause is already confirmed.
• One cheap observation settles the cause or one option plainly dominates every requirement.
• The criteria cannot be made operational; clarify them before assigning weights.
• The task is forward failure discovery for a planned change rather than diagnosis or option selection.

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