Evaluation, inspection, review, verification, checking, confirming, acceptance, approval: these are all words that have similar, yet different, definitions.
If you were asked to inspect, approve, or evaluate something (such as a product, system, or installation) what would you need to know in order to accomplish that task? You would need to have some idea of the criteria used to make that thing. It is the same with product specifications. Unless the product specification is written in a manner that has measurable results, one cannot evaluate the product to ensure that it has met the desired results and original intent.