 ITRANS, ISCII, IAST (and the near-identical ISO 15919), and Harvard-Kyoto romanization schemes have been employed primarily for usage by non-native speakers who are more familiar with the Latin alphabet.Transliteration between the three scripts can be complicated, particularly when transliterating between Devanagari and Persian scripts.One obstacle to this is that multiple different letters in one script often all correspond to the same letter in the other script.