The book offers a comprehensive overview of forms of modern Irish within a general linguistic framework. Starting with information on the sociolinguistics of modern Irish and on the overall sound system of the language, it then proceeds with a tripartite division of the present-day language into northern, western and southern Irish. It gives specific information on the features of each dialect and considers many sub-divisions, using maps and tables to illustrate clearly what is the subject of discussion. There are several innovations in the book, such as a system of lexical sets which facilitate the description and analysis of variation and change in modern Irish.