Mae’n hanfodol sicrhau bod ehangder yr wybodaeth yn gywir er mwyn hwyluso gwaith gwerthuso a gwella, boed ar lefel genedlaethol neu ar lefel ysgol. Fodd bynnag, hoffwn bwysleisio bod Llywodraeth Cymru yn disgwyl i wybodaeth gael ei defnyddio i gynorthwyo ysgolion ac awdurdodau lleol i ddeall eu cyd-destunau eu hunain ac i wella eu cynnig eu hunain. Ni ddylid ei defnyddio ar wahân er mwyn barnu ynghylch perfformiad neu i gymharu ysgolion, a dylid creu gwybodaeth at ddiben clir.
It is crucial to have the right breadth of information to support evaluation and improvement, whether at a national level or a school level, but I wish to emphasise that the Welsh Government’s expectation is that information is used to support schools and local authorities to understand their own contexts and improve their own offer.  It should not be used in isolation to judge performance or compare schools and information should be created for a clear purpose.