The three divisions of the Inner Tantras are: * Mahayoga * Anuyoga * Atiyoga also known as Dzogchen or the Great Perfection. Other schools call them "Father Tantras", "Mother Tantras" and "Non-Dual Tantras" . Among other factors, the three divisions differ in terms of the emphasis they place on the generation stage and completion stage of tantric practice. The Mahayoga emphasizes the generation stage, Anuyoga the completion stage and Atiyoga the synthesis and transcendence of both.