Cyhoeddwyd mewn cyswllt â 'Chyfrifiad Ysgolion Blynyddol ar Lefel Disgyblion' y Cynulliad Cenedlaethol = Published in association with the National Assembly's Pupil Level Annual School Census.
Drwg yn y data II = Data demons II. Published by Llywodraeth Cynulliad Cymru in 2006. Publication and catalogue information, links to buy online and reader comments.