Where the policy approach departs from that supported by the evidence the reasons for doing so, and the approach taken, must be clearly explained.
Pan fo’r ymagwedd polisi yn gwyro oddi wrth hynny a gefnogir gan y dystiolaeth, rhaid esbonio’n glir y rhesymau dros wneud hynny, a’r ymagwedd a fabwysiadwyd.