Evaluation
Level 2
Systematically testing whether an AI system's output is actually good.
Term 4 of 6 in Building AI systems
In plain language
Evaluation, often shortened to evals, means running a fixed set of test cases and scoring the results. Without it, "the new model feels better" is the only evidence anyone has.
Think of it like this
A tasting panel with a scorecard instead of one chef's opinion.
Why it matters
Evals are what separate teams that improve their AI feature from teams that just change it.