Plain-English guides to physical, operational and engineered systems.Inputs • dependencies • controls • failure • maintenance

Use this checklist to describe a bottleneck more clearly before assuming a solution.

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How to use this tool responsibly

Use the result to understand relationships and ask better questions. Do not use it for engineering design, compliance, safety-critical operations, emergency decisions, or maintenance instructions.

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Browse the article library or use the glossary to clarify terms before comparing system options.

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