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Preface vii

• An instructor’s guide that gives advice on how to use the book in different courses
and explains the relationship between the chapters in this edition and previous
editions.
• Further information on the book’s case studies.

• Additional case studies that may be used in software engineering courses.
• Additional PowerPoint presentations on systems engineering.
• Four web chapters covering formal methods, interaction design, application
architectures, and documentation.

All of this material is available free to readers of the book from the book’s web-
site or from the Pearson support site below. Additional material for instructors is
available on a restricted basis to accredited instructors only:

• Model answers to selected end-of-chapter exercises.
• Quiz questions and answers for each chapter.

All support material, including restricted material, is available from:
http://www.pearsonhighered.com/sommerville/
Instructors using the book for teaching may obtain a password to access restricted
material by registering at the Pearson website, by contacting their local Pearson rep-
resentative, or by requesting a password by e-mail from computing@aw.com.
Passwords are not available from the author.

Acknowledgments

A large number of people have contributed over the years to the evolution of this
book and I’d like to thank everyone (reviewers, students, and book users) who have
commented on previous editions and made constructive suggestions for change.
I’d particularly like to thank my family (Anne, Ali, and Jane) for their help and
support while the book was being written. A big thank-you especially to my daugh-
ter, Jane, who discovered a talent for proofreading and editing. She was tremen-
dously helpful in reading the entire book and did a great job spotting and fixing a
large number of typos and grammatical errors.
Ian Sommerville
October 2009