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Evaluation (evals)

Systematic testing of an AI system against a curated set of inputs to measure quality on the dimensions the business cares about — accuracy, faithfulness, safety, format.

Definition

What Evaluation (evals) means in practice

Evaluation is the practice of systematically testing an AI system against a curated set of inputs and scoring the outputs on the dimensions the business actually cares about. For RAG: context precision, context recall, answer faithfulness, answer relevance. For classification: standard precision, recall, F1, calibration. For generation: a custom SME-built rubric scored either by humans or by a strong LLM as judge. The discipline that distinguishes a serious deployment from a demo is running the evals on every change — model update, prompt change, retrieval-pipeline change — and blocking deployment on regressions. Teams that ship without evals discover quality regressions in production; teams with evals catch them before merge.

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