This translation of Kathavatthu by S. Z. Aung and Mrs. C. A. F. Rhys Davids, was originally published in 1915. It is a scholarly critical edition that provides notes, indexes, diagrams and other aids to understanding the reasons and order of secessions of the myriad schools of Buddhism. Mrs. Rhys Davids' prefatory notes in this translation are a very useful introduction and guide to this fifth book of the Abhidhamma. There are alternate listings of the points of controversy discussed in the Kathavatthu in the Table of Contents of the translation according to: Canonical Order-Grouped under Subjects of Discourse-Grouped According to the Dissentient Schools. There are diagrams of the secessions of various schools of Buddhism according to three different sources. Indexes: I. Quotations from the Canon II. Subjects III. Pali Words Discussed The PTS Pali edition is Kathavatthu