Yn fy natganiad ar 2 Chwefror, pwysleisiais bwysigrwydd defnyddio data cadarn i ysgogi gwelliant mewn ysgolion ac yn y system drwyddi draw. Mae mynd ati’n frwd i hunanwerthuso a gosod targedau gan ddefnyddio data ar berfformiad yn allweddol i hyrwyddo gwelliant parhaus. Am y rheswm hwn, rydym wedi darparu set data craidd Cymru gyfan i’r holl ysgolion cynradd ac uwchradd a gynhelir. Felly, mae ganddynt wybodaeth allweddol am berfformiad yr ysgol mewn fformat cyson, tryloyw a hygyrch.
In my statement on 2 February I emphasised the importance of using robust data to drive improvement within schools and across the system.  Robust self-evaluation and target-setting using performance data plays a vital role in promoting continuous improvement.  For this reason, we have provided all maintained primary and secondary schools with the all-Wales core data set.  This provides key information about school performance in a consistent, transparent and accessible format.