This volume comprises 28 papers presented at the 1st International Conference on Non-Dominant Varieties of Pluricentric Languages in Graz (Austria) in July 2011. The conference was also held in memory of Michael Clyne – eminent linguist, scholar, language enthusiast and advocate of multilingualism who died in October 2010. The volume pays homage to his important contributions in many fields of linguistics and in the theory of pluricentric languages. The conference in Graz was the first international event to document the situation of non-dominant varieties world-wide in order to identify common or diverging features. It provided substantial insights into the codification and in corpus and status planning of non-dominant varieties. The volume deals with 18 languages and 31 different national and other varieties in 29 countries of the world.