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Fundamentals of Software Engineering 2ND Editionby Carlo Ghezzi
Preface to the Second Edition
The first edition of this book was published in 1991. Since then, there has been a lot of progress in computing technology and also in software engineering. Certainly the proliferation of the Internet has had a profound influence on education, research, development, business, and commerce. We decided to produce this second edition in order to bring the book up to date with respect to the advances in software engineering in the last 10 years.
We were pleased to find that the basic premise of the book—the durability and importance of principles—has been borne out by the passage of time: Even though the technology has improved, principles of software engineering have remained the same. We have therefore been able to update every chapter without changing the original structure of the book. The following is still the structure:
The product-related chapters follow the sequence consisting of design (4), specification (5), and verification (6). This is different from the approach taken by other books, which cover specification before design. The reason for our choice follows from the principles-based approach of the book. All of these activities—design, specification, and verification—are basic activities that must be learned and applied throughout the software life cycle. For example, design is something we do not only with software architecture, but also with software specifications. The modular design approach helps us structure software and also the specification documents. Other books present specification first and then design, allegedly because—according to the traditional software processes—first we specify a software and then we design it. By contrast, we believe that learning about the design activity and approaches first, creates the needed motivation for the study of specification and provides the skills and techniques for structuring those specifications.
While all areas of software engineering have evolved since the first edition of the book was written, the area of tools and environments has changed substantially. Chapter 9, therefore, is revised considerably. Our approach in this chapter also is to present primarily principles rather than specific tools. We have seen over the years that tools change as technology evolves, and the choice of what particular tools to study depends on the student's environment and focus. We therefore cover a framework for studying and evaluating software tools without a detailed look at any particular tools.
Besides many minor improvements and changes, we have made the following major additions:
In Chapter 3, we have added two new case studies, one of a simple compiler and the other of the elevator system that we use throughout much of the book. The two case studies are complementary in that they deal with different application areas and pose different design challenges. They are presented in this chapter in a simple and intuitive way to get the student oriented towards thinking of system issues. They are intended to illustrate the use of general principles with concrete examples.
In Chapter 4, we have extended the treatment of object orientation, software architecture, components, and distributed systems.
In Chapter 5, we have added a treatment of Z and UML. A new section gives a more systematic treatment of requirements engineering.
In Chapter 6, we have added model checking and GQM as evaluation and verification techniques.
In Chapter 7, we have included a treatment of the unified process, the open-source process, and the synchronize-and-stabilize process. We have also added a new case study on requirements engineering.
In Chapter 8, we have added the capability maturity model and a description of the Nokia software factories.
In Chapter 9, we have added a treatment of the concurrent versioning system (CVS).
In Chapter 10, we have provided coverage of the Software Engineering Code of Ethics.
In the appendix, we have added a new case study on the use of formal methods in industry.
THE ROLE OF OBJECT ORIENTATION
The book covers the principles of object orientation in a balanced way, rather than as the only way to do software engineering. Object-oriented analysis, design, and programming have certainly evolved and become a dominant approach to software engineering. We believe, however, that the principles underlying software engineering are deeper than objects. What the student should learn are principles and methods that can be used in different approaches. The student should learn how to choose between approaches and should be able to apply object orientation when it is the right choice. For example, the student should learn about information hiding before learning about objects and inheritance.
THE PURPOSE OF CASE STUDIES
The case studies presented throughout the book and also in the appendix have two purposes. One is to present the issues discussed in a larger context, in order to give the student a broader view of why the principles or techniques are important. The second reason is to give those students who have not seen real projects a picture of realistic projects. The case studies are necessarily simplified to focus on important issues, but we have found that they are useful especially to less experienced students. The study of software engineering poses a challenge in a university setting because the typical student has not been exposed to the problems that software engineers face daily. These case studies attempt to overcome this challenge.
A companion CD, including solutions and sample course sylllabi is available to instructors. A companion Web site is available through the publisher to both students and instructors. You may contact the authors through the Web site. We welcome your feedback, comments, and suggestions.
Palo Alto, California
Preface to the First Edition
This is a textbook on software engineering. The theme underlying the book is the importance of rigor in the practice of software engineering. Traditional textbooks on the subject are based on the lifecycle model of software development—that is, requirements, specification, design, coding, maintenance—examining each phase in turn. In contrast, our presentation is based on important principles that can be applied independently of the lifecycle model and often in several phases of the lifecycle. Our emphasis is on identifying and applying fundamental principles that are applicable throughout the software lifecycle.
The general characteristics of the book are the following:
This book embodies our beliefs in the use of fundamental principles and the importance of theory in the practice of engineering. We have used the material in this book in both university and professional courses on various aspects of software engineering.
This book is designed to be used as a textbook by students of software engineering either in a classroom or for self-study. Professional engineers and managers will find material here to convince them of the usefulness of modern practices of software engineering and the need to adopt them. It may be used by professionals who are willing to invest the time for serious study; it is not really appropriate for a cursory reading. In particular, wherever necessary, we have sacrificed breadth for depth. For the professional, the notes on further references will be especially helpful. An Instructor's Manual is available with ideas for course organizations and solutions to some of the exercises.
The book is designed for junior, senior, or beginning-graduate level students in computer science. The reader must have had a course in data structures and should be fluent in one or more programming languages. We assume that the reader is already proficient in programming. Analytical reasoning, although not strictly necessary, will greatly enhance the ability of the reader to appreciate the deeper concepts of the book. This skill is developed by mathematics courses such as calculus, discrete mathematics, or-even better-theoretical computer science. "Mathematical maturity" is necessary for the student of any engineering discipline.
ORGANIZATION AND CONTENT
Software engineering is a large, multi-dimensional discipline. Organizing a textbook on the subject poses a challenge because a textbook should present material sequentially, but the many facets of software engineering are so interrelated that there is no optimal sequence of topics. We have organized this textbook based on the view that in software engineering:
The book thus has three technical sections dealing in turn with the software product (Chapters 4 through 6), the software engineering process and management (Chapters 7 and 8), and the software engineering environment (Chapter 9). Chapters 1 through 3 form a general introduction to the field and the subsequent more technical sections of the book.
In Chapter 2, we discuss the many facets of software and common desirable characteristics for software. These characteristics impose constraints on the software builder and the process to be used. In Chapter 3, we present principles for building high-quality software. By studying principles rather than specific tools, the student gains knowledge that is independent of a particular technology and application environment. Because technology changes and environments evolve, the student should be armed with principles and techniques that can be utilized in different application areas. Chapters 4 through 8 present and discuss techniques for applying the principles of Chapter 3 to, respectively, design, specification, verification, engineering process, and engineering management. In Chapter 9, we discuss the use of computers themselves to help in the building of software. We postpone the discussion of any specific tools to this chapter.
While the material in the first two sections should withstand the passage of time, it is likely that the material in the third section will become outdated (we hope) because newer and better tools are being developed. Since programming languages are a fundamental tool of the software engineer, we use Chapter 9 as a bridge between the design issues of Chapter 4 and specific programming language constructs.
The book contains many exercises of three types:
Solutions to some of the exercises are provided at the end of each chapter. More exercise solutions are given in the Instructor's Manual.
Several case studies are used in the text to demonstrate the integration of different concepts and to contrast different approaches in realistic situations. In addition, three case studies of real-life software engineering projects and their analyses are presented at the end of the book. These case studies may be read and studied at different times and for different purposes. From these case studies, the new student with little industrial experience can gain a quick view of the diversity of problems faced in industrial practice. The student with some experience perhaps will identify with certain aspects of these case studies and learn from others. The case studies may be read concurrently with the main text. Several exercises in the book refer to these case studies.
Many software engineering courses combine lectures and a laboratory project. To do this in a single semester is rather difficult. The teacher will find himself discussing organizational issues while the students are concentrating on their daily forays into debugging. We believe that software engineering must be taught as all other engineering disciplines by first providing the student with a solid foundation in the "theory." Only after this has been achieved will laboratory experience enhance the student's knowledge. This implies that the student project must start closer to the middle of the semester rather than at the beginning. In our view, a better approach is to spend one semester on the theory and a second semester on the laboratory. The Instructor's Manual offers several ideas for organizing a laboratory course based on this text.
The book may be read in different sequences and at different levels. Each of Chapters 4 through 7 contains material that may be skipped on the first reading or for a less detailed study. Chapters 1 through 3 are required reading for the subsequent chapters. The graph shows the dependencies among the chapters and the various paths through the book. The notation nP refers to a partial reading of Chapter n, skipping some sections; nC stands for a complete reading.
The Instructor's Manual discusses different course organizations based on the book. The conventional one-semester project software engineering course may follow the sequence: 1, 2, 3, 7P, SP, 4P, 6P, 8, 9,10. We ourselves prefer the sequence 1, 2, 3, 4P, 5P, 6P, 7P, 8, 9,10. In either case, the students should start on the project after 5P
We gratefully acknowledge reviews of earlier drafts provided by Reda A. Ammar of the University of Connecticut, Larry C. Christensen of Brigham Young University, William E Decker of the University of Iowa, David A. Gustafson of Kansas State University, Richard A. Kemmerer of the University of California at Santa Barbara, John C. Knight of the University of Virginia, Seymour V Pollack of Washington University, and K. C. Tai of North Carolina State University.
We would also like to thank the following people who have provided valuable feedback on various drafts of the manuscript: Vincenzo Ambriola, Paola Bertaina, David Jacobson, and Milon Mackey.
Hewlett-Packard Laboratories and Politecnico di Milano made it possible to conceive this book by supporting a course offered by Mehdi Jazayeri at the Politecnico di Milano during the spring of 1988. Alfredo Scarfone and HP Italiana provided us with support in Italy. We would like to acknowledge the support of management at Hewlett-Packard Laboratories, especially John Wilkes, Dick Lampman, Bob Ritchie, and Frank Carrubba in Palo Alto, and Peter Porzer in Pisa. We would like to thank Bart Sears for his help with various systems, and John Wilkes for the use of his data base for managing references. We have also received support from Consiglio Nazionale delle Ricerche.
Palo Alto, California
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