Writing Better Requirements / Edition 1

Writing Better Requirements / Edition 1

by Ian Alexander, Richard Stevens
     
 

ISBN-10: 0321131630

ISBN-13: 9780321131638

Pub. Date: 08/28/2002

Publisher: Addison-Wesley

Experience has shown us that investment in the requirements process saves time, money, and effort. Yet, development efforts consistently charge ahead without investing sufficiently in the requirements process. We are so intent to develop the technical solutions that we are unwilling to take the time and effort to understand and meet the real customer

Overview

Experience has shown us that investment in the requirements process saves time, money, and effort. Yet, development efforts consistently charge ahead without investing sufficiently in the requirements process. We are so intent to develop the technical solutions that we are unwilling to take the time and effort to understand and meet the real customer needs.
--From the Foreword by Ralph R. Young, author of Effective Requirements Practices

Who is it for?

If you are involved in the systems engineering process, in any company -- from transport and telecommunications, to aerospace and software -- you will learn how to write down requirements to guarantee you get the systems YOU need.

What skills will I learn?

  • How to write simple, clear requirements -- so you get what you want
  • How to organize requirements as scenarios -- so everyone understands what you want
  • How to review requirements -- so you ask for the right things

0321131630B05282002

Product Details

ISBN-13:
9780321131638
Publisher:
Addison-Wesley
Publication date:
08/28/2002
Edition description:
New Edition
Pages:
176
Sales rank:
793,801
Product dimensions:
6.28(w) x 9.19(h) x 0.38(d)

Table of Contents

  • Table of Contents

    1. Introduction 9

  • 1.1 Why do requirements matter? 9

    1.2 Who are requirements for? 12

    1.3 Different names for requirements 13

    1.4 Different types of specification 14

    1.5 The challenge of writing better requirements 15

    1.6 The requirements writing process 18

    2. Identifying the stakeholders 21

    2.1 Different types of stakeholder 21

    2.2 Your house extension: a simple case? 22

    2.3 A practical approach to identifying stakeholders 23

    Exercise 1: Listing the stakeholders 23

    3. Gathering requirements from stakeholders 26

    3.1 Possible techniques 26

    Exercise 2: Asking 'why?' 28

    3.2 Interviews 28

    3.3 Workshops 32

    3.4 Experiencing life as a user 36

    3.5 Observing users at work 36

    3.6 Acting out what needs to happen 36

    3.7 Prototypes 38

    4. Other sources of requirements 40

    4.1 Possible sources 40

    Exercise 3: Extracting requirements from source documents 44

    Exercise 4: Extracting requirements from a memo 45

    4.2 Getting requirements for mass-market products 45

    4.3 User requirements in subsystem projects 46

    5. Structuring the requirements 47

    5.1 You need structure as well as text 47

    5.2 Breaking the problem down into steps 48

    5.3 Organizing requirements into scenarios 50

    5.4 Examples of goal decomposition 52

    Exercise 5: A structure for user requirements 53

    5.5 Handling exceptions 53

    Exercise 6: Could anything go wrong here? 54

    Exercise 7: Exceptions 55

    5.6 Examples and exercises in requirement structure 57

    Exercise 8: Creating a heading structure 57

    Exercise 9: The right document for each subject 57

    Exercise 10: Wrongly placed requirements 58

    6. Requirements in context 59

    6.1 The user requirements document 59

    6.2 Organizing the constraints 60

    Exercise 11: Writing constraints 64

    6.3 Defining the scope 64

    Exercise 12: Restricting the scope 65

    6.4 Requirement attributes 65

    6.5 Keeping track of the requirements 67

    7. Requirements writing 70

    7.1 Quality, not perfection 70

    7.2 Sketch, then improve 70

    7.3 Anatomy of a good requirement 70

    7.4 Guidelines for good requirements 71

    7.5 Don't write like this 72

    Exercise 13: Good requirements 75

    Exercise 14: Writing requirements for familiar domestic systems 75

    Exercise 15: Ambiguous requirements 76

    8. Checking and reviewing 78

    8.1 Checking the document structure with users 78

    8.2 Checking the requirements 80

    Exercise 16: Checking individual requirements 81

    Exercise 17: Checking a set of requirements 82

    8.3 Reviewing 83

    8.4 Success - the reviewed document 85

    Exercise 18: Reviewing 85

    A: Answers to exercises 87

    Exercise 1: Listing the stakeholders 87

    Exercise 2: Asking 'why?' 87

    Exercise 3: Extracting requirements from source documents 87

    Exercise 4: Extracting requirements from a memo 88

    Exercise 5: A structure for user requirements 88

    Exercise 6: Could anything go wrong here? 89

    Exercise 7: Exceptions 89

    Exercise 8: Creating a heading structure 90

    Exercise 9: The right document for each subject 90

    Exercise 10: Wrongly placed requirements 90

    Exercise 11: Writing constraints 91

    Exercise 12: Restricting the scope 92

    Exercise 13: Good requirements 92

    Exercise 14: Writing requirements for familiar domestic systems 93

    Exercise 15: Ambiguous requirements 93

    Exercise 16: Checking individual re

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