Mae'r newid yn un o blith cyfres o fesurau a luniwyd i wella safonau mewn ysgolion - gan roi'r pwyslais ar addysgu a dysgu, ar lesiant disgyblion ac athrawon ac ar leihau biwrocratiaeth ddiangen.
The change is just one of a series of measures designed to improve standards in schools - turning the focus to teaching and learning, the well-being of pupils and teachers and reducing unnecessary bureaucracy.