In 2007–2008, 23 so called "pioneer-municipalities" (Lantsch/Lenz, Brienz/Brinzauls, Tiefencastel, Alvaschein, Mon, Stierva, Salouf, Cunter, Riom-Parsonz, Savognin, Tinizong-Rona, Mulegns, Sur, Marmorera, Falera, Laax, Trin, Müstair, Santa Maria Val Müstair, Valchava, Fuldera, Tschierv and Lü) introduced Rumantsch Grischun as the language of instruction in 1st grade, followed by an additional 11 (Ilanz, Schnaus, Flond, Schluein, Pitasch, Riein, Sevgein, Castrisch, Surcuolm, Luven and Duvin) the following year and another 6 (Sagogn, Rueun, Siat, Pigniu, Waltensburg/Vuorz and Andiast) in 2009–2010. However, other municipalities, including the entire Engadine valley and most of the Surselva, continued to use their regional variety. The cantonal government aimed to introduce Rumantsch Grischun as the sole language of instruction in Romansh schools by 2020.