This book brings together dozens of proven patterns for creating use cases that more accurately reflect real requirements, are easier to translate into working systems, and are simpler to maintain. Utilizing these patterns, architects, analysts, engineers, and managers can leverage decades of hard-earned knowledge to achieve far better results, far more quickly. The authors carefully describe how each pattern works, what problems it is intended to solve, and the consequences associated with using it. All patterns are supported with detailed examples and platform-independent class models that demonstrate how they may be realized. All constructs and diagrams reflect the current UML 2.0 standard. This book also includes an insightful use-case primer that will be indispensable both to novices and veteran modelers seeking to become more effective.