Acknowledgments

Four people deserve special thanks: Robert ``Corky'' Cartwright, who co-developed a predecessor of Rice's introductory course with the first author; Daniel P. Friedman, for asking the first author to rewrite The Little LISPer (also MIT Press) in 1984, because it started this project; John Clements, who designed, implemented, and maintains DrScheme's stepper; and Paul Steckler, who faithfully supported the team with contributions to our suite of programming tools.

The development of the book benefited from many other friends and colleagues who used it in their courses and/or gave detailed comments on early drafts. We are grateful to them for their help and their patience: Ian Barland, John Clements, Bruce Duba, Mike Ernst, Kathi Fisler, Daniel P. Friedman, John Greiner, John Stone, Geraldine Morin, and Valdemar Tamez.

A dozen generations of Comp 210 students at Rice University used early drafts of the text and contributed improvements in various ways. In addition, numerous attendees of our TeachScheme! workshops used early drafts in their classrooms. Many sent in comments and suggestions. As representative of these we mention the following active contributors: Ms. Barbara Adler, Dr. Stephen Bloch, Mr. Jack Clay, Dr. Richard Clemens, Mr. Kyle Gillette, Ms. Karen Buras, Mr. Marvin Hernandez, Mr. Michael Hunt, Ms. Karen North, Mr. Jamie Raymond, and Mr. Robert Reid. Christopher Felleisen patiently worked through the first few parts of the book with his father and provided direct insight into the views of a young student. Thank you to everyone.

Finally, Matthias expresses his gratitude to Helga for her many years of patience and for creating a home for an absent-minded husband and father. Robby is grateful to Hsing-Huei Huang for her support and encouragement; without her, he would not have gotten anything done. Matthew thanks Wen Yuan for her constant support and enduring music. Shriram is indebted to Kathi Fisler for support, patience and puns, and for her participation in this project.