In this book, intended as a language companion to Design Patterns: Elements of Reusable Object-Oriented Software by Gamma, Helm, Johnson & Vlissides, noted Smalltalk and design patterns experts implement the 23 design patterns using Smalltalk code. Using the same successful format as Design Patterns, this book tailors the topic of design patterns to the Smalltalk programmer - no other book offers this. The authors have worked closely with the Design Patterns authors to ensure that this companion volume is held to the same high quality standards that made the original a best-seller. The full source code is available on Addison-Wesley's web site.