Software engineering 8th ed.pdf

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Software Engineering

Preface

Contents

Part 1 Overview

Introduction

Socio-technical systems

Critical systems

Software processes

Project management

Part 2 Requirements

Software requirements

Requirements engineering processes

System models

Critical systems specification

Formal specification

Part 3 Design

Architectural design

Distributed systems architectures

Application architectures

Object-oriented design

Real-time software design

User interface design

Part 4 Devlopment

Rapid software development

Software reuse

Component-based software engineering

Critical systems development

Software evolution

Part 5 Verification and Validation

Verification and validation

Software testing

Critical systems validation

Part 6 Management

Managing people

Software cost estimation

Quality management

Process improvement

Configuration management

Part 7 Emerging Technologies

Security engineering

Service-oriented software engineering

Aspect-oriented software development

Glossary

References

Index

0321313798_cover.qxd 26/4/06 17:48 Page 1 Software Engineering SOMMERVILLE Software Engineering 8 The 8th edition of the best-selling introduction to software engineering is now updated with three new chapters on state-of-the-art topics. NEW CHAPTERS IN THE 8TH EDITION • Security engineering, showing you how you can design software to resist attacks and recover from damage; • Service-oriented software engineering, explaining how reusable web services can be used to develop new applications; • Aspect-oriented software development, introducing new techniques based on the separation of concerns. Log on to aw-bc.com/computing for a full list of Computing titles. an imprint of KEY FEATURES • Includes the latest developments in software engineering theory and practice, integrated with relevant aspects of systems engineering. • Extensive coverage of agile methods and reuse. • Integrated coverage of system safety, security and reliability – illustrating best practice in developing critical systems. • Two running case studies (an information system and a control system) illuminate different stages of the software lifecycle. ONLINE RESOURCES Visit www.pearsoned.co.uk/sommerville to access a full range of resources for students and instructors. In addition, a rich collection of resources including links to other websites, teaching material on related courses and additional chapters is available at http://www.software-engin.com. IAN SOMMERVILLE is Professor of Software Engineering at the University of St. Andrews in Scotland ISBN 0-321-31379-8 9 780321 313799 www.pearson-books.com SOMMERVILLE S O M M E R V I L L E i E n g n e e r i n g S o f t w a e r 8 Software Engineering 8 .

Software Engineering Eighth Edition This 8th edition has enhanced the 7th edition with new material on security engineering, service-oriented software engineering and aspect-oriented software development. For educational purposes, it is completely compatible with the 7th edition. Visit the Software Engineering, eighth edition Companion Website at www.pearsoned.co.uk/sommerville to find valuable student learning material including: • Lecture presentations (in PowerPoint and PDF) for all chapters in the book • Class quiz questions for each chapter • Case studies • Project suggestions • Suggestions for further reading and links to web resources for each chapter SE8_A01.qxd 4/4/06 8:53 Page i •• .

SE8_A01.qxd 4/4/06 8:53 Page ii International Computer Science Series Selected titles in the series Operating Systems J Bacon and T Harris Programming Language Essentials H E Bal and D Grune Programming in Ada 95, 2nd ed J G P Barnes Java Gently, 3rd ed J Bishop Software Design, 2nd ed D Budgen Concurrent Programming A Burns and G Davies Introductory Logic and Sets for Computer Scientists N Nissanke Human-Computer Interaction J Preece et al Algorithms F Rabhi and G Lapalme Ada 95 From the Beginning, 3rd ed J Skansholm C++ From the Beginning, 2nd ed J Skansholm Java From the Beginning, 2nd ed J Skansholm Real-Time Systems and Programming Languages, 3rd ed A Burns and A Wellings Object-Oriented Programming in Eiffel, 2nd ed P Thomas and R Weedon Database Systems, 4th ed T Connolly and C Begg Distributed Systems, 4th ed G Coulouris, J Dollimore and T Kindberg Fortran 90 Programming, 2nd ed T M R Ellis, I R Phillips and T M Lahey Program Verification N Francez Introduction to Programming using SML M Hansen and H Rischel Functional C P Hartel and H Muller Algorithms and Data Structures, 2nd ed J Kingston Miranda S Thompson Haskell, 2nd ed S Thompson Discrete Mathematics for Computer Scientists, 2nd ed J K Truss Compiler Design R Wilhem and D Maurer Discover Delphi S Williams and S Walmsley Comparative Programming Languages, 3rd ed R G Clark •• .

SE8_A01.qxd 4/4/06 8:53 Page iii Software Engineering Eighth Edition Ian Sommerville •• .

SE8_A01.qxd 4/4/06 8:53 Page iv Pearson Education Limited Edinburgh Gate Harlow Essex CM20 2JE England and Associated Companies around the World. Visit us on the World Wide Web at: www.pearsoned.co.uk First published 1982 Second Edition 1984 Third Edition 1989 Fourth Edition 1992 Fifth Edition 1995 Sixth Edition 2001 Seventh Edition 2004 Eighth Edition 2007 © Addison-Wesley Publishers Limited 1982, 1984 © Pearson Education Limited 1989, 1995, 2001, 2004, 2007 The right of Ian Sommerville to be identiﬁed as author of this Work has been asserted by him in accordance with the Copyright, Designs and Patents Act 1988. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without either the prior written permission of the publisher or a licence permitting restricted copying in the United Kingdom issued by the Copyright Licensing Agency Ltd, 90 Tottenham Court Road, London W1T 4LP. All trademarks used herein are the property of their respective owners. The use of any trademark in this text does not vest in the author or publisher any trademark ownership rights in such trademarks, nor does the use of such trademarks imply any affiliation with or endorsement of this book by such owners. ISBN 13: 978-0-321-31379-9 ISBN 10: 0-321-31379-8 British Library Cataloguing-in-Publication Data A catalogue record for this book is available from the British Library Library of Congress Cataloging-in-Publication Data A catalog record for this book is available from the Library of Congress 10 9 8 7 6 5 4 3 2 10 09 08 07 06 Typeset by 35 in 10/12.5pt Times Printed and bound in the United States of America •• .

SE8_A01.qxd 4/4/06 8:53 Page v Preface The first edition of this textbook on software engineering was published more than twenty years ago. That edition was written using a dumb terminal attached to an early minicomputer (a PDP-11) that probably cost about $50,000. I wrote this edition on a wireless laptop that cost less than $2,000 and is many times more powerful than that PDP-11. Software then was mostly mainframe software, but personal computers were just becoming available. None of us then realised how pervasive these would become and how much they would change the world. Changes in hardware over the past twenty or so years have been absolutely remark- able, and it may appear that changes in software have been equally significant. Certainly, our ability to build large and complex systems has improved dramatically. Our national utilities and infrastructure—energy, communications and transport— rely on very complex and, largely, very reliable computer systems. For building business systems, there is an alphabet soup of technologies—J2EE, .NET, EJB, SAP, BPEL4WS, SOAP, CBSE—that allow large web-based applications to be deployed much more quickly than was possible in the past. However, although much appears to have changed in the last two decades, when we look beyond the specific technologies to the fundamental processes of soft- ware engineering, much has stayed the same. We recognised twenty years ago that the waterfall model of the software process had serious problems, yet a survey published in December 2003 in IEEE Software showed that more than 40% of companies are still using this approach. Testing is still the dominant program validation technique, although other techniques such as inspections have been used more effectively since the mid-1970s. CASE tools, although now based around the UML, are still essentially diagram editors with some checking and code-generation functionality. •• .

SE8_A01.qxd 4/4/06 8:53 Page vi vi Preface Our current software engineering methods and techniques have made us much better at building large and complex systems than we were. However, there are still too many projects that are late, are over budget and do not deliver the software that meets the customer’s needs. While I was writing the 7th edition, a government enquiry in the UK reported on the project to provide a national system to be used in courts that try relatively minor offenders. The cost of this system was estimated at £156 million and it was scheduled for delivery in 2001. In 2004, costs had escalated to £390 million and it was still not fully operational. There is, therefore, still a pressing need for software engineering education. Over the past few years, the most significant developments in software engineer- ing have been the emergence of the UML as a standard for object-oriented system description and the development of agile methods such as extreme programming. Agile methods are geared to rapid system development, explicitly involve the user in the development team, and reduce paperwork and bureaucracy in the software process. In spite of what some critics claim, I think these approaches embody good software engineering practice. They have a well-defined process, pay attention to system specification and user requirements, and have high quality standards. However, this revision has not become a text on agile methods. Rather, I focus on the basic software engineering processes—specification, design, development, verification, and validation and management. You need to understand these processes and associated techniques to decide whether agile methods are the most appropriate development strategy for you and how to adapt and change methods to suit your particular situation. A pervasive theme of the book is critical systems—systems whose failure has severe consequences and where system dependability is critical. In each part of the book, I discuss specific software engineering techniques that are relevant to critical systems engineering. Books inevitably reflect the opinions and prejudices of their authors. Some readers will disagree with my opinions and with my choice of material. Such dis- agreement is a healthy reflection of the diversity of the discipline and is essential for its evolution. Nevertheless, I hope that all software engineers and software engineering students can find something of interest here. The structure of the book The structure of the book is based around the fundamental software engineering processes. It is organised into seven parts. The first six focus on software processes and the final part discusses some important new software engineering technologies. Part 1: Introduces software engineering, places it in a broader systems context and presents the notions of software engineering processes and management. •• •• .

SE8_A01.qxd 4/4/06 8:53 Page vii Preface vii Part 2: Covers the processes, techniques and deliverables that are associated with requirements engineering. It includes a discussion of software requirements, system modelling, formal specification and techniques for specifying dependability. Part 3: This part is devoted to software design and design processes. Three out of the six chapters focus on the important topic of software architectures. Other topics include object-oriented design, real-time systems design and user interface design. Part 4: Describes a number of approaches to development, including agile methods, software reuse, CBSE and critical systems development. Because change is now such a large part of development, I have integrated material on software evolution and maintenance into this part. Part 5: Focuses on techniques for software verification and validation. It includes chapters on static V & V, testing and critical systems validation. Part 6: This part covers a range of management topics: managing people, cost estimation, quality management, process improvement and configuration management. Part 7: The final part includes three chapters that are devoted to important new technologies that are already starting to be used. The chapters cover security engineering, service-oriented software engineering and aspect-oriented software development. In the introduction to each part, I discuss the structure and organisation in more detail. Changes from the 7th edition This new edition of my textbook can be thought of as a mid-life upgrade than a radical new revision of the book. I have designed it to be completely compatible with the 7th edition but have included a new section on Emerging Technologies. This discusses recent developments which I believe are significant for the future of software engineering. This section includes three additional chapters: 30. Security engineering where I discuss issues of how to ensure that your soft- ware is secure and can resist external attacks. 31. Service-oriented software engineering where I describe new approaches to application development using reusable web services. 32. Aspect-oriented software development where I introduce a new technique of software development based around the separation of concerns. As the other chapters in the book are still current and relevant, I have not mod- ified these, apart from very small changes to link to the new material in Chapters 30–32. More information on changes and the differences between the 6th and 7th editions is available from the book website. •• •• .

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