This section is devoted to the third (and second-highest) of the four classes of tantra – Yoga Tantra (རྣལ་འབྱོར་རྒྱུད་, rnal ’byor rgyud, yogatantra) – and begins with the root tantra of this class, the Compendium of Reality of all Thus-Gone Ones(དེ་བཞིན་གཤེགས་པ་ཐམས་ཅད་ཀྱི་དེ་ཁོ་ན་ཉིད་བསྡུས་པ་, de bzhin gshegs pa thams cad kyi de kho na nyid bsdus pa, Sarva-tathāgata-tattva-saṃgraha) (D.481). Much like the preceding Highest Yoga Tantra section, Situ’s catalog divides the texts here between works that focus primarily on “methods” (ཐབས་, thabs, upāya) and those that focus primarily on “wisdom” or “insight” (ཤེས་རབ་, shes rab, prajñā).
In terms of the historical development of Buddhist tantra in India, Yoga Tantra represents the first true cycle of tantras, with texts related in varying degrees, often through the central deity of Vairocana (རྣམ་པར་སྣང་མཛད་, rnam par snang mdzad). Butön Rinchendrup (བུ་སྟོན་རིན་ཆེན་གྲུབ་, bu ston rin chen grub, 1290-1364), arguably the foremost Tibetan scholar of Yoga Tantra, describes the structure of this cycle of texts as consisting of the following three types:
Concordant tantras (ཆ་མཐུན་གྱི་རྒྱུད་, cha mthun pa'i rgyud, *bhāgīya-tantra).
Situ’s catalog uses these categories in the “methods” section.
Literature:
Dalton, Jacob. “A Crisis of Doxography: How Tibetans Organized Tantra During the 8th-12th Centuries.” Journal of the International Association of Buddhist Studies 28:1 (2005): 115–181.
Mkhas-grub Dge-legs-dpal-bzang-po. Mkhas Grub Rje’s Fundamentals of the Buddhist Tantras: Rgyud Sde Spyiḥi Rnam Par Gźag Pa Rgyas Par Brjod. Translated by F. D. Lessing and Alex Wayman. Indo-Iranian Monographs 8. The Hague: Mouton, 1968.
Snellgrove, David L. Indo-Tibetan Buddhism: Indian Buddhists and Their Tibetan Successors, 2 vols. Boston: Shambhala, 1987.
Weinberger, Steven Neal. “The Significance of Yoga Tantra and the Compendium of Principles (Tattvasaṃgraha Tantra) within Tantric Buddhism in India and Tibet.” Ph.D. dissertation, University of Virginia, 2003.
Weinberger, Steven Neal. “The Yoga Tantras and the Social Context of Their Transmission to Tibet.” Chung-hwa Buddhist Journal, no. 23 (2010): 131-66.
Williams, Paul and Anthony Tribe. “Tantric Texts: Classification and Characteristics.” In Buddhist Thought: A Complete Introduction to the Indian Tradition, 202–217. New York: Routledge, 2000.