The Abhidhammattha-saṅgaha (The Compendium of Things contained in the Abhidhamma) is a Pali Buddhist instructional manual or compendium of the Abhidhamma of the Theravāda tradition. It was written by the Sri Lankan monk Ācariya Anuruddha some time between the 8th century and the 12th century.
According to Bhikkhu Bodhi, the Abhidhammattha-saṅgaha is one of the most important texts in the Theravāda Abhidhamma tradition and it provides such a "masterly summary" of the Abhidhamma that "has become the standard primer for Abhidhamma studies throughout the Theravāda Buddhist countries of South and Southeast Asia."
As noted by Bhikkhu Bodhi, the growth of the Theravāda Abhidhamma into a complex and massive textual tradition, that included both the already large and difficult Abhidhamma Pitaka and numerous commentaries by exegetes like Buddhaghosa (which fills more than 40 volumes in the PTS latin script edition), made it difficult to study for novices. Thus, there arose a need for concise summaries for teaching novices. While there were various texts written for this purpose, the fifty page saṅgaha became the most popular such text because of "its remarkable balance between concision and comprehensiveness."
Ācariya Anuruddha did not introduce any new content or doctrines into the Theravāda Abhidhamma in this text, the work is a compendium or textbook of doctrine. His sources include the Abhidhamma Pitaka and the Visuddhimagga of Buddhaghosa. However, his organization and systematization of Abhidhamma content is unique and innovative. According to Jeffrey Wayne Bass, Anuruddha organized the text with an emphasis on the domain of experience (avacara) in which a given type of consciousness may be encountered. He presents the Abhidharma content into a stratified schema which mirrors Buddhist meditative development (from ordinary mind states to higher states of jhana). Thus, it is also a text which can be seen as a guide to meditative attainment.
Anuruddha also condensed Abhidhamma teachings by introducing new categories such as "universal" mental factors (sabbacittasadharana), which allowed him to present the material in a much shorter form (in contrast to the Dhammasangani for example). This conciseness made it easy to memorize and transmit, and likely contributed to its popularity.
Because of its short length, this text has been difficult to understand, and therefore various commentaries have been written on it:
The Abhidhammatthasangaha was first translated into English by Shwe Zan Aung (between 1895 and 1905), and this was revised and edited by Mrs. C.A.F Rhys Davids and first printed in 1910.
The Sangaha was also translated into English by Narada Maha Thera, with explanatory notes. The American monk Bhikkhu Bodhi released an updated version with the title "A comprehensive manual of Abhidhamma", with explanations of each section by Ven. U Rewata Dhamma and numerous charts and tables provided by Ven. U Silananada. A supplement to this text is 'Process of Consciousness and Matter by Ven. Dr. Rewata Dhamma'.