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Process for System Architecture and Requirements Engineering

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Process for System Architecture and Requirements Engineering

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  • Copyright 2014
  • Edition: 1st
  • eBook (Watermarked)
  • ISBN-10: 0-13-349200-1
  • ISBN-13: 978-0-13-349200-2

 This is the digital version of the printed book (Copyright © 2000).

Derek Hatley and Imtiaz Pirbhai—authors of Strategies for Real-Time System Specification—join with influential consultant Peter Hruschka to present a much anticipated update to their widely implemented Hatley/Pirbhai methods.

Process for System Architecture and Requirements Engineering introduces a new approach that is particularly useful for multidisciplinary system development: It applies equally well to all technologies and thereby provides a common language for developers in widely differing disciplines.

The Hatley-Pirbhai-Hruschka approach (H/H/P) has another important feature: the coexistence of the requirements and architecture methods and of the corresponding models they produce. These two models are kept separate, but the approach fully records their ongoing and changing interrelationships. This feature is missing from virtually all other system and software development methods and from CASE tools that only automate the requirements model.

System managers, system architects, system engineers, and managers and engineers in all of the diverse engineering technologies will benefit from this comprehensive, pragmatic text. In addition to its models of requirements and architecture and of the development process itself, the book uses in-depth case studies of a hospital monitoring system and of a multidisciplinary groundwater analysis system to illustrate the principles.

Compatibility Between the H/H/P Methods and the UML:

The Hatley/Pirbhai architecture and requirements methods—described in Strategies for Real-Time System Specification—have been widely used for almost two decades in system and software development. Now known as the Hatley/Hruschka/Pirbhai (H/H/P) methods, they have always been compatible with object-oriented software techniques, such as the UML, by defining architectural elements as classes, objects, messages, inheritance relationships, and so on. In Process for System Architecture and Requirements Engineering, that compatibility is made more specific through the addition of message diagrams, inheritance diagrams, and new notations that go with them. In addition, state charts, while never excluded, are now specifically included as a representation of sequential machines.

These additions make definition of the system/software boundary even more straightforward, while retaining the clear separation of requirements and design at the system levels that is a hallmark of the H/H/P methods—not shared by most OO techniques. Once the transition to software is made, the developer is free to continue using the H/H/P methods, or to use the UML or any other software-specific technique.



Download figures 9-5, 10-18, 11-2, 11-10, 11-11 and 11-20 from Process for System Architecture and Requirements Engineering here.

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Introduction to Process for System Architecture and Requirements Engineering

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Table of Contents

Foreword     xvii
Preface    xix
Figures and Tables        xv

Part I:  Concepts          1

Chapter 1:   Introduction          3

1.1 Purpose and Scope  3

1.2 The System Development Process  4

1.3 Underlying Principles  4

1.2 What's in a Name?  5

1.3 Audience for and Structure of the Book  6

1.4 A Participative Case Study on the Web  7

1.5 A Caveat 8

Chapter 2:  What Is a System?         9

2.1 System Characteristics  9

2.2 Views of a System  18

2.3 System Requirements  24

2.4 System Summary  40

Chapter 3:  A Framework for Modeling Systems         41

3.1 A Model Framework  41

3.2 Models in General  41

3.3 Exploiting System Hierarchies  45

3.4 Exploiting the What/How Classification  49

3.5 Exploiting the Information/Material/Energy Classification 55

3.6 Layered Models: The Truth at Last! 60

3.7 Model Framework Summary 70

Chapter 4:  System Development Models        72

4.1 Overview 72

4.2 Architecture Model 74

4.3 Requirements Model 112

4.4 Requirements Dictionary 162

4.5 Requirements/Architecture Relationships 170

4.6 A Note on Object Orientation 178

4.7 System Models Summary and Further Reading 180

Chapter 5:  The System Development Process         181

 5.1 Process, Methods, and Tools 181

5.2 The Nature of the Development Process 183

5.3 The Process and the Methods 190

5.4 Roles of the System Architect and System Engineer 200

5.5 System Development Process Summary 204

Chapter 6:  Applying the Models to Development         205

6.1 Overview 205

6.2 Understanding the Generic Development Structure 206

6.3 Example: A Patient-Monitoring System 209

6.4 Configuring Software and Computer Hardware 236

6.5 Modeling the Numerous Hardware Technologies 244

6.6 Computer Hardware Layers 251

6.7 Software Layers 253

6.8 Summaries 273

Chapter 7:  System Development Overview Using a Meta-Model         275

7.1 Introduction 275

7.2 A Meta-Model for Development Projects 276

7.3 An Essential Model of the Development Process 277

7.4 The Enhanced Development Model 281

7.5 The Development Architecture Context 284

7.6 Development Process Architecture 288

7.7 Development Process Task Allocation 291

7.8 Variations on the Architecture Template   291

Part II:  Case Study: Groundwater Analysis System         297

Chapter 8:  Initial Problem Statement         299

8.1 Overview 299

8.2 Required Capabilities 300

8.3 Required Performance 301

8.4 Required Constraints 301

Chapter 9:  Modeling the Known Pieces         304

9.1 Overview 304

9.2 The Requirements Context 304

9.3 The System Timing Specification 305

9.4 The Entity Model 307

9.5 The Existing Sampling Module 311

Chapter 10:  Building Upon the Known Pieces         316

10.1 Top-Level Essential Model 316

10.2 Enhancing the Essential Model 331

10.3 Architecture Context 341

10.4 Building Up from the Existing Sampling Module 343

10.5 What Do We Have, and What Is Missing? 346

Chapter 11:   Filling in the Blanks         348

11.1 Introduction 348

11.2 Architecture Modules 348

11.3 Allocating the Enhanced Requirements Model 349

11.4 Enhancing the Allocated Models 357

11.5 Adding the Architecture Flows and Interconnects 362

11.6 Flow-to-Interconnect Allocations 362

11.7 Merging the Top-Down and Bottom-Up Pieces 364

Chapter 12:  Completing the Models         375

12.1 Introduction 375

12.2 Accuracy Allocation 375

12.3 Timing Allocation–Concurrent Architecture Modules 376

12.4 Architecture Module Specifications 378

12.5 Architecture Interconnect Specifications 382

12.6 Requirements and Architecture Dictionaries 383

Chapter 13:   Groundwater Analysis System Summary         387

13.1 Overview 387

Appendix:  Changes, Improvements, and Misconceptions Since the Methods' Introduction         389

A. 1   A Learning Experience 389

A. 2   Changes and Improvements  390

A. 3   Misconceptions about the Methods 397

Glossary         401

Bibliography           419

Index         425


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