Jeremy, Dick – författare

We live in a commercial world where much of our work is undertaken through a project -oriented approach. This has the advantage of determining the cost and time of the project to be undertaken, which in their turn are based on the knowledge of what the project is to deliver. Computing is no different in this regard, and so in order to organize our activities, we need to know what it is that is to be delivered. Hence Requirements Engineering, an organized approach to determining what is required in the project/ system that is being undertaken. There are some problems with the idea of Requirements Engineering, which I have on previous occasions encapsulated in a single sentence called ''The Mock Theorem of Information Systems'' which states ''There exists some point in time when everyone involved in the system knows what they want and agrees with everyone else'' Clearly nonsense (how would you know what everyone is agreeing to for example?). But in order to build a system on a project basis, this sentence has to be assumed to be true (either explicitly, or even worse, implicitly). Then Requirements Engineering can be made to work, and the correct prod­ uct/ system delivered by the project. However, we do not have an established alternative to the project approach, and the business world is used to projects. So Requirements Engineering is necessary, but it needs tempering to allow for the desired certainty actually being unknown.

Using the latest research and driven by practical experience from industry, the third edition of this popular book provides useful information to practitioners on how to write and structure requirements.• Explains the importance of Systems Engineering and the creation of effective solutions to problems• Describes the underlying representations used in system modelling and introduces the UML2• Considers the relationship between requirements and modelling• Covers a generic multi-layer requirements process• Discusses the key elements of effective requirements management• Explains the important concept of rich traceabilityIn this third edition the authors have updated the overview of DOORS to include the changes featured in version 9.2. An expanded description of Product Family Management and a more explicit definition of Requirements Engineering are also included.Requirements Engineering is written for those who want to develop their knowledge of requirements engineering, whether practitioners or students.

This second edition follows quickly on the ?rst edition and is an indication of how fast the subject is changing and developing. In the past two years there have been signi?cant advances and these are re?ected in this new edition. Essentially, this is an update that places more emphasis on modelling by describing a greater range of approaches to system modelling. It introduces the UML2, which is the recent standard approved by the OMG. There is also an enhanced discussion on the relationship between requirements management and modelling, which relates well to the concept of rich traceability. The chapter on the requirements management tool DOORS has been revised to use Version 7 of the tool and this is complemented with examples taken from the DOORS/Analyst tool which demonstrates how the concepts of modelling can be captured and created within DOORS. The text is still aimed at students and practitioners of systems engineering who are keen to gain knowledge of using requirements engineering for system development. As before, a web site supporting additional material is available at: http://www.requirementsengineering.info Elizabeth Hull Ken Jackson Jeremy Dick June 2004 vii Preface to the First Edition Requirements Engineering is common sense, but it is perceived to be dif?cult and is not well understood. For these reasons it is generally not very well done.

Using the latest research and driven by practical experience from industry, the third edition of this popular book provides useful information to practitioners on how to write and structure requirements.• Explains the importance of Systems Engineering and the creation of effective solutions to problems• Describes the underlying representations used in system modelling and introduces the UML2• Considers the relationship between requirements and modelling• Covers a generic multi-layer requirements process• Discusses the key elements of effective requirements management• Explains the important concept of rich traceabilityIn this third edition the authors have updated the overview of DOORS to include the changes featured in version 9.2. An expanded description of Product Family Management and a more explicit definition of Requirements Engineering are also included.Requirements Engineering is written for those who want to develop their knowledge of requirements engineering, whether practitioners or students.

Updated with new developments, ideas and thinking, as well as new tool descriptions, the fourth edition of this popular book is driven by practical experience from industry. It provides invaluable information on how to write and structure requirements, whilst explaining the importance of Systems Engineering and the creation of effective solutions to problems.This edition contains an expanded discussion of “design agnosticism” as an important principle in Requirements Engineering, and new insights regarding the validation and verification process in the context of the Systems Engineering “V” model. Further new elements include a discussion of SysML in the chapter on modelling techniques, and the use of SysML diagrams to present the generic process. Readers will also discover the latest thinking on requirements flow-down and rich traceability and an update to the chapter on tools to present DOORS Next Generation. Requirements Engineering is written by practitioners for practitioners and students who want to develop their knowledge of the subject area.

Updated with new developments, ideas and thinking, as well as new tool descriptions, the fourth edition of this popular book is driven by practical experience from industry. It provides invaluable information on how to write and structure requirements, whilst explaining the importance of Systems Engineering and the creation of effective solutions to problems.

This edition contains an expanded discussion of “design agnosticism” as an important principle in Requirements Engineering, and new insights regarding the validation and verification process in the context of the Systems Engineering “V” model. Further new elements include a discussion of SysML in the chapter on modelling techniques, and the use of SysML diagrams to present the generic process. Readers will also discover the latest thinking on requirements flow-down and rich traceability and an update to the chapter on tools to present DOORS Next Generation.

Requirements Engineering is written by practitioners for practitioners and students who want to develop their knowledge of the subject area.