An Caighdeán Oifigiúil, the official standard for writing in the Irish language, was first published in 1958 under the title Gramadach na Gaeilge agus Litriú na Gaeilge – An Caighdeán Oifigiúil. That publication laid out the grammar and orthography rules for the Irish language for those using Irish for official purposes – in legislation, in official State publications, in the education system, in the media and in various other fields.
An Caighdeán Oifigiúil was compiled in Rannóg an Aistriúcháin (the Translation Section of the Houses of the Oireachtas). Reprints were issued regularly between the years 1960 and 2004 and a revised edition was published in 2012.
An Caighdeán Oifigiúil was given statutory status in 2013 and it was decided that the first statutory review should be carried out without delay. In September 2014, members of the public and other interested parties were asked to make submissions regarding An Caighdeán Oifigiúil. An Advisory Committee was also established, which worked tirelessly for a year and a half to identify issues and to make recommendations.
The result of this work is the new edition of An Caighdeán Oifigiúil, published by the Houses of the Oireachtas Service in 2016. It is available for purchase from the Government Supplies Agency and an electronic version can be accessed here: