This book deals primarily with the creation and enhancement of the quality of software models. The Unified Modeling Language (UML) of the Object Management Group forms the basis of the software models discussed in this book; through its standard visual models, UML provides the much needed common mechanism to establish communication between all parties within a software project. Additionally, the book deals with quality assurance in UML-based projects. A major element of the book is the SWOT analysis (here meaning Strengths, Weaknesses, Objectives and Traps), which is applied to all UML diagrams so that the advantages and disadvantages of each diagram are easily demonstrated.Throughout the book, the author uses a single running example, the LUCKY insurance system, to demonstrate the basic features of UML in early chapters and quality analysis in later ones.