The venerable Anuruddha’s Abdhidhammattha Sangaha is a masterpiece. It is one of the most important and influential works within Theravāda Buddhism and together with the Visuddhimagga, written by the venerable Buddhagosa, it is one of the standard works for anyone who wants to delve into the ancient Buddhist teachings.
In nine short chapters the complete Abhidhamma, the profound doctrine on the ultimate reality which in the Pali Canon comprises seven thick books, is summarized. The work here shown is an English translation with explanations by Bhikkhu Bodhi.