The sixth book of the Abhidhamma Piṭaka. It is divided into ten chapters (called Yamaka) — Mūla, Khandha, Āyatana, Dhātu, Sacca, Saṅkhārā, Anusaya, Citta, Dhamma, and Indriya. The method of treatment of each of the ten divisions tends to be threefold. Firstly, a Paṇṇattivara (Paññattivāra) or section delimitating the term and concept, divided into an Uddesavāra, stating the inquiries only, and a Niddesavāra, wherein the inquiries are repeated with their several answers. Secondly, and mainly, there is the Pavattivāra, referring not to procedure generally, but to living processes, and, lastly, the Pariññāvāra, dealing with the extent to which a given individual (i.e., a class of beings) understands the category under consideration.

There is a Commentary to the Yamaka by Buddhaghosa, which is included in the Pañcappakaraṇaṭṭhakathā.

See P.T.S. edn., i.xix ff; the Yamaka has been published by the P.T.S. 1911, 1913.