The Kathāvatthu (Points of Controversy) is a collection of over 200 discussions on points of interpretation of Buddhist doctrine. These consist of a debate between unnamed protagonists. Each relies either on logic or quotations from the suttas to support their arguments. Some of the discussions concern central problems in Buddhist philosophy, such as the nature of not-self, or the problem of continuity and impermanence. Many, however, are very minor. While the text does not identify the points of view, most of the significant points may be identified with the doctrines held by various Buddhist schools. Note that none of the controverted points deal with Brahmanical, Jaina, or other non-Buddhist views. Nor are there any significant differences when it comes to the suttas; each debater assumes that they share a common sutta basis. The Kathāvatthu is the only book of the Abhidhamma ascribed by the Theravāda to a specific author, Moggaliputtatissa, a senior monk at the time of King Ashoka. The core of the work probably formed then, but it grew substantially over time. A couple of the core discussions appear to share a common basis with the Vijñānakāya.