Diben y system yw darparu cefnogaeth ac annog gwella ar y cyd, yn hytrach na gosod labeli na llunio tablau cynghrair moel. Mae'n broses sy'n rhoi ysgolion mewn sefyllfa sy'n eu galluogi nhw i nodi'r ffactorau sy'n cyfrannu at eu cynnydd a'u llwyddiant ac i ddeall pa feysydd sy'n rhaid canolbwyntio arnyn nhw i sicrhau eu bod yn parhau i ddatblygu.
The system is about providing support and encouraging collaborative improvement and is not about labelling or creating crude league tables.  It is about putting schools into a position that enables them to identify what are the factors that contribute to their progress and achievement or what are the areas to focus on to achieve further development.