It explains how the ALN system is intended to achieve its aims and objectives, by making explicit the expected inputs, activities, outcomes, and impacts, as well as the assumed links between them.
Bwriad y gwerthusiad yw archwilio gweithrediad y Ddeddf a'i heffeithiau er mwyn asesu i ba raddau y mae'r effeithiau, y costau a'r manteision a ragwelir yn cael eu gwireddu, i bwy, sut a pham.