Evidence-based medicine's GRADE framework independently splits quality of evidence from strength of recommendation, calling their fusion a source of confusion

The GRADE (Grading of Recommendations Assessment, Development and Evaluation) framework, introduced to a broad clinical audience by Guyatt et al. in the BMJ (2008), rates two properties of a piece of medical guidance separately rather than folding them into one number: how good the underlying evidence is, and how strongly a recommendation should be made on the strength of it. The paper states this as a design principle, not an incidental detail: "Not all grading systems separate decisions regarding the quality of evidence from strength of recommendations. Those that fail to do so create confusion." The two axes can diverge in either direction — "High quality evidence doesn't necessarily imply strong recommendations, and strong recommendations can arise from low quality evidence."

This supplies a third field independently converging on the same source-vs-content split as the Admiralty Code's reliability/credibility pair and reliability-aware RAG's reliability/relevance split — see observation-intelligence-doctrine-and-rag-independently-derived-a-two-axis-source-model. Unlike those two, GRADE's authors state an explicit preference: in their own venue, they call fusing the axes a defect rather than a simplification. That preference bears directly on [[question-should-vault-source-tier-split-into-two-axes|whether the vault's own source_tier field should split]].