Develop evaluation frameworks to enable the Welsh Government to meet its commitment to review the devolved taxes in 3 to 5 years from April 2018.
Datblygu fframweithiau gwerthuso er mwyn galluogi Llywodraeth Cymru i ddiwallu ei hymrwymiad i adolygu'r trethi datganoledig o fewn tair i bum mlynedd o fis Ebrill 2018.