Mae'r system gategoreiddio hon wedi'i seilio ar dri cham:Cam un: ystyried data a ddarperir gan Lywodraeth Cymru yn seiliedig ar set o feini prawf y cytunwyd arnynt ar gyfer ysgolion cynradd ac uwchraddCam dau: ystyried hunanwerthusiad ysgolion a'u gallu i wella eu hunain gan ganolbwyntio ar yr arweinyddiaeth, yr addysgu a'r dysguCam tri: pennu dwy radd - llythyren 'A-D' yn seiliedig ar allu'r ysgolion i wella, a chategori lliw. Mae'r categori lliw yn arwain at raglen o gefnogaeth, her ac ymyrraeth sydd wedi'i theilwra'n benodol ar gyfer pob ysgol. Mae'r categorïau hefyd yn cael eu defnyddio i gynllunio'r modd y caiff adnoddau'r consortia eu targedu a'u defnyddio.
The national school categorisation system is based on 3 steps:Step 1: is a data driven element that is provided by Welsh Government based on an agreed set of criteria for both primary and secondary schoolsStep 2: is led by consortia and takes into account schools’ self-evaluation and capacity to self-improve in relation to leadership and teaching and learningStep 3: is led by consortia and generates 2 grades - a letter ‘A-D’ based on schools’ ability to improve and a coloured support category. The coloured support category for each school triggers a bespoke programme of support, challenge and intervention. The support category is also used by consortia to plan and deploy their resources.