KCAE.EVAL:4.6 - Make the adoption and refresh decision

Relate observed gains and losses to the original use. Keep the incumbent when the addition does not earn its build and maintenance burden. Adopt a narrower profile when it helps one stratum but not another. Change the source preparation, route, assessor, delivery, observer or memory indicated by the evidence. A source gap may require obtaining a source rather than improving retrieval.

Name what the evidence supports, what it leaves untested and which condition reopens the decision. A changed corpus, model, language population, authority rule, workload or privacy constraint can defeat the original comparison. Preserve an operational fallback and observation during a bounded rollout if that is the selected use. A favorable laboratory result alone is not deployment or human benefit.