This fourteenth-century text by Butön Rinchendrup, one of Tibet's greatest scholars, is a detailed introduction to the system of tantra known as Yoga Tantra. It includes a presentation and discussion of the major Yoga Tantra practices as well as descriptions of each Yoga Tantra text and a history of Yoga Tantra lineages in India and Tibet.

The descriptions of individual Yoga Tantra texts include the teacher, place, audience, and time of the teaching of the text in addition to summaries on a section-by-section basis of the content of the text. The discussion of the Compendium of Reality of all Thus-Gone Ones (de bzhin gshegs pa thams cad kyi de kho na nyid bsdus pa, Tattvasaṃgraha) – the central text in the Yoga Tantra corpus – is particularly extensive and detailed.

This text also discusses the origin-stories for the tantras in India, how Yoga Tantra came to Tibet, as well as the Yoga Tantra lineages in India and Tibet.  (Steven Weinberger 2005-11-08)