Persian alphabet
As a result of the influence of Islam in the region, Tajik was written in the Persian alphabet up to the 1920s. Until this time, the language was not thought of as separate and simply considered a dialect of the Persian language. The Soviets began by simplifying the Persian alphabet in 1923, before moving to a Latin-based system in 1927. The Latin script was introduced by the Soviet Union as part of an effort to increase literacy and distance the, at that time, largely illiterate population, from the Islamic Central Asia. There were also practical considerations. The regular Persian alphabet, being an abjad, does not provide sufficient letters for representing the vowel system of Tajik. In addition, the abjad is more difficult to learn, each letter having different forms depending on the position in the word.