First of all, thanks to everyone around the world who purchased the previous editions of this book. The daily positive feedback from readers continues to astound and encourage me.

Many of the ideas for the topics in this book came from postings to the Excel Internet newsgroups. Thanks to all who frequent these services; your problems and questions were the inspiration for many of the examples I present in this book.

This book would not be in your hands if it weren't for the talented people at Hungry Minds, Inc., including Susan Christophersen, my project editor. Special thanks to Bill Manville, my technical editor. Bill provided lots of great feedback and suggestions, and set me straight on more than a few issues.

Finally, thanks to Katlyn, my wonderful daughter and the joy of my life.

John Walkenbach

La Jolla, California

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