República Socialista Soviética de Tayikistán
The Persian alphabet is used for both Farsi (Iranian) and Dari (Afghan). Traditionally, Tajiki is also written with Perso-Arabic script. In order to increase literacy, a Latin alphabet (based on the Common Turkic Alphabet) was introduced in 1917. Later in the late 1930s, the Tajik Soviet Socialist Republic promoted the use of Cyrillic alphabet, which remains the most widely used system today. Attempts to reintroduce the Perso-Arabic script were made.