One of the seven books of the Abhidhamma Piṭaka; it is generally placed second in the list (e.g., Mil. 12). It deals in a general way with the different categories and formulas given in the Dhammasaṅgaṇī, though different methods of treatment are used. The book is divided into eighteen chapters, each of which is called a Vibhaṅga. Each chapter has three portions: Suttantabhājaniya, Abhidhammabhājaniya and Paññāpucchaka or list of questions. The Commentary to the Vibhaṅga is called Sammohavinodanī.