Yn achos ysgolion uwchradd, bydd y bandio cyntaf hwn yn defnyddio data o ganlyniadau arholiadau allanol 2010.  Diben hyn yw sicrhau bod gan ysgolion, cyrff llywodraethu, ac awdurdodau lleol, ar ddechrau tymor yr hydref, wybodaeth fandio yn ogystal â gwybodaeth allweddol arall am berfformiad i lywio trafodaethau am berfformiad, cymharu a phennu targedau. Pan fydd data arholiadau 2011 gennym, caiff y bandiau eu diweddaru ac anfonir hysbysiad arall at yr ysgolion.
For secondary schools, this initial banding will use data up to the 2010 external examination results. This is to ensure that schools, governing bodies and local authorities have banding information alongside other key performance information to inform discussion on relative performance and target setting early in the autumn term. Once we have data for the 2011 examinations the banding will be updated and the revised information sent to schools.