Mae categoreiddio'n cynnig dull cyfannol o wella ysgolion, sy'n caniatáu i'r consortia addysg rhanbarthol ystyried cyd-destun ysgolion wrth bennu dyfarniad ynghylch hunanwerthusiad ysgol a'i chapasiti i wella.
Categorisation offers a holistic approach to school improvement, which allows the regional education consortia to take the context of the school into account when determining a judgement on the school`s self-evaluation and capacity to improve.