Cafodd Adolygiad Mathias, a gyhoeddwyd ym mis Mehefin 2011, ei gynnal yn sgil pryderon am oedi wrth weithredu amserlen Comisiwn Ffiniau Llywodraeth Leol Cymru ar y pryd  (“y Comisiwn”) ar gyfer cynnal adolygiadau etholiadol, ei fethodoleg a gallu’r Comisiwn i gyflawni ei amcanion. Penodwyd Glyn Mathias ym mis Mawrth 2011 gan fy rhagflaenydd, Carl Sargeant AC, i gynnal yr adolygiad. Recriwtiodd Mr Mathias Max Caller a Peter Mackay, Cadeiryddion Comisiwn Ffiniau Llywodraeth Leol Lloegr a Chomisiwn Ffiniau Llywodraeth Leol Iwerddon, i’w gynorthwyo. Mae eu hadroddiad ar-lein.
The Mathias Review, published in June 2011, was carried out following concerns about delays in the then Local Government Boundary Commission for Wales (“the Commission”) timetable for conducting electoral reviews, its methodology and the capacity of the Commission to deliver its objectives. Glyn Mathias was appointed in March 2011 by my predecessor Carl Sargeant AM to carry out the review. Mr Mathias recruited Max Caller and Peter Mackay, respective Chairs of the English and Scottish Local Government Boundary Commissions, to assist him. Their report can be accessed online.