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01 ·RAG & Retrieval·★ MEMBER·PAPER·13 min read Evaluating RAG in Practice — Turning “Seems Better” Into a Number RAG improvement work gets lost because quality is judged as one vague feeling. This article builds up the metrics that separate retrieval from generation, the definitions of faithfulness and relevance, how to build an eval set with synthetic QA and where that goes wrong, and how many questions you need before the number means anything.