This manual has been in the works since version 4.0.0. Completion of this manual would not have been possible without the help and encouragement of a lot of people. The outstanding vtiger team, its user community, and a number of people contributed technical feedback as this book was being written. I also thank the people who contributed to this manual with informal reviews, suggestions, and fixes during the writing process.

While the following is by no means a complete list, this book would be incomplete and incorrect without the help of Emilio Paolini, Walter Schönenbröcher, and Dirk Gorny. A special thank goes to David Adams who reviewed the English manual edition.