They should draw upon approaches for which there is strong evidence so that they can demonstrate their use of the PDG is evidence informed.
Dylent ddefnyddio dulliau gweithredu y ceir tystiolaeth gref i'w cefnogi fel y gallant ddangos bod y defnydd a wnânt o'r Grant Datblygu Disgyblion wedi'i lywio ar dystiolaeth.