Designing object-oriented software is hard, and designing reusable object-oriented software is even harder. Experience shows that many object-oriented systems exhibit recurring structures or “design patterns” of communicating and collaborating objects that promote extensibility, flexibility, and reusability. This tutorial describes a set of fundamental design patterns and, through a design scenario, demonstrates how to build reusable object-oriented software with them. The tutorial covers the roles design patterns play in the object-oriented development process: how they provide a common vocabulary, reduce system complexity, and how they act as reusable architectural elements that contribute to an overall system architecture. Attendee Background: Attendees should understand basic object-oriented concepts, like polymorphism and type versus interface inheritance, and should have had some experience designing object-oriented systems. No prior knowledge of design patterns is required. Familiarity with Java is recommended. Presenter: John Vlissides is a member of the research staff at the IBM T.J. Watson Research Center in Hawthorne, NY. He has practiced object-oriented technology for over a decade as a designer, implementer, researcher, lecturer, and consultant. John is author of Pattern Hatching, co-author of Design Patterns and Object-Oriented Application Frameworks, and co-editor of Pattern Languages of Program Design 2. He has published many articles and technical papers on object-oriented themes in general and design patterns in particular. John is a columnist for Java Report and serves as Consulting Editor of Addison-Wesley’s Software Patterns Series. He has a Ph.D. in Electrical Engineering from Stanford University.

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