Chagatai language
The first period is a transitional phase characterized by the retention of archaic forms; the second phase starts with the publication of Ali-Shir Nava'i's first Divan and is the highpoint of Chagatai literature, followed by the third phase, which is characterized by two bifurcating developments. One is the preservation of the classical Chagatai language of Nava'i, the other trend is the increasing influence of the dialects of the local spoken languages.