Business rules represent a radically new approach to expressing user requirements. Based on data models, they take non-procedurality to a level never seen before. They will revolutionize analysis and design techniques for business information systems."The Business Rule Book" introduces "Ross Method", a graphic technique for expressing business policies and practices directly in rigorous fashion. More than simply a collection of functions or processes to executive, it views a business as a collection of rules. Its ultimate goal is to make turning these rules on or off as easy as flipping light switches.At the heart of "Ross Method" is a classification of business rules, called the "Chart of Atomic Rule Types". In the new chemistry of information systems, these atomic rule types are formed easily into powerful compounds to represent more complex user requirements. "Ross Method" shows how.