Published in 1995, Design Patterns: Elements of Reusable Object-Oriented Software has elicited a great deal of praise from the press and readers. The 23 patterns contained in the book have become an essential resource for anyone developing reusable software designs. In response to a great number of requests from readers of the book and from the object-oriented community as a whole, these designs patterns, along with the entire text of the book, are being made available on CD. This electronic version will enable students to install the patterns directly onto a computer and create an architecture for using and building reusable components. Produced in HTML format, the CD is heavily cross-referenced with numerous links to the online text.