Apart from classical Mahāyāna Buddhist practices like the six perfections, Tibetan Buddhism also includes tantric practices, such as deity yoga and the Six Dharmas of Naropa as well as methods which are seen as transcending tantra, like Dzogchen.
In Tibetan Buddhism, practices are generally classified as either Sutra (or Pāramitāyāna) or Tantra (Vajrayāna or Mantrayāna), though exactly what constitutes each category and what is included and excluded in each is a matter of debate and .
Vajrayāna along with Mantrayāna, Guhyamantrayāna, Tantrayāna, Secret Mantra, Tantric Buddhism, and Esoteric Buddhism are names referring to Buddhist traditions associated with Tantra and "Secret Mantra".
Practitioners of Vajrayāna need to abide by various tantric vows or pledges called samaya.
These are extensions of the rules of the Prātimokṣa and Bodhisattva vows for the lower levels of tantra, and are taken during initiations into the empowerment for a particular Unsurpassed Yoga Tantra.
The special tantric vows .
In Tibetan Buddhist scholasticism, Buddhist philosophy is traditionally propounded according to a hierarchical classification of four classical Indian philosophical schools, known as the "four tenets" (drubta shyi).
While the classical tenets-system is limited to four tenets (Vaibhāṣika, Sautrāntika, Yogācāra, and Madhyamaka), there are further sub-classifications within these different tenets.
This classification does not include Theravada, the only surviving of the 18 classical schools of Buddhism.
It also does not include other Indian Buddhist schools, such as .