Suttavibhanga (-vibhaṅga, Pali for "rule analysis") is the first book of the Theravadin Vinaya Pitaka. It is a commentary on the community rules (Patimokkha). The general form of the commentary is that each rule is preceded by a story telling how the Buddha came to lay it down, and followed by explanations. Sometimes this includes further stories acting as "judicial precedents". It is divided into two parts, covering the rules for monks and nuns, respectively. The monks' rules are divided as follows: