This book describes a requirements lifecycle based on the Rational Unified Process (RUP) framework, from business modeling through to analysis and design. The process utilizes a subset of the Unified Modeling Language (UML) to describe this process with 'real' examples, which demonstrate an effective method for software development in almost any situation. It includes some of the most useful software development practices and the most common UML notations. (Version 3 corrects grammar, reorganizes some content and fixes broken cross-references in version 2.)