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SysML Distilled: A Brief Guide to the Systems Modeling Language

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  • Copyright 2014
  • Dimensions: 7" x 9-1/8"
  • Pages: 304
  • Edition: 1st
  • eBook (Watermarked)
  • ISBN-10: 0-13-343036-7
  • ISBN-13: 978-0-13-343036-3

The Systems Modeling Language (SysML) extends UML with powerful systems engineering capabilities for modeling a wider spectrum of systems and capturing all aspects of a system’s design.  SysML Distilled is the first clear, concise guide for everyone who wants to start creating effective SysML models.

(Drawing on his pioneering experience at Lockheed Martin and NASA, Lenny Delligatti illuminates SysML’s core components and provides practical advice to help you create good models and good designs. Delligatti begins with an easy-to-understand overview of Model-Based Systems Engineering (MBSE) and an explanation of how SysML enables effective system specification, analysis, design, optimization, verification, and validation. Next, he shows how to use all nine types of SysML diagrams, even if you have no previous experience with modeling languages. A case study running through the text demonstrates the use of SysML in modeling a complex, real-world sociotechnical system.

Modeled after Martin Fowler’s classic UML Distilled, Delligatti’s indispensable guide quickly teaches you what you need to know to get started and helps you deepen your knowledge incrementally as the need arises. Like SysML itself, the book is method independent and is designed to support whatever processes, procedures, and tools you already use.

Coverage Includes

  • Why SysML was created and the business case for using it
  • Quickly putting SysML to practical use
  • What to know before you start a SysML modeling project
  • Essential concepts that apply to all SysML diagrams
  • SysML diagram elements and relationships
  • Diagramming block definitions, internal structures, use cases, activities, interactions, state machines, constraints, requirements, and packages
  • Using allocations to define mappings among elements across a model
  • SysML notation tables, version changes, and sources for more information

Sample Content

Table of Contents

Foreword by Rick Steiner         xvii

Foreword by Richard Soley         xix

Preface         xxv

Acknowledgments         xxxi

About the Author         xxxiii

Chapter 1: Overview of Model-Based Systems Engineering         1

1.1 What Is MBSE? 2

1.2 The Three Pillars of MBSE 4

1.3 The Myth of MBSE 9

Chapter 2: Overview of the Systems Modeling Language         11

2.1 What SysML Is–and Isn’t 11

2.2 Yes, SysML Is Based on UML–but You Can Start with SysML 13

2.3 SysML Diagram Overview 14

2.4 General Diagram Concepts 17

Chapter 3: Block Definition Diagrams         23

3.1   Purpose 23

3.2   When Should You Create a BDD? 24

3.3   The BDD Frame 24

3.4   Blocks 26

3.5   Associations: Another Notation for a Property 44

3.6   Generalizations 49

3.7   Dependencies 52

3.8   Actors 53

3.9   Value Types 55

3.10 Constraint Blocks 57

3.11 Comments 59

Chapter 4: Internal Block Diagrams         63

4.1   Purpose 63

4.2   When Should You Create an IBD? 64

4.3   Blocks, Revisited 64

4.4   The IBD Frame 65

4.5   BDDs and IBDs: Complementary Views of a Block 66

4.6   Part Properties 67

4.7   Reference Properties 67

4.8   Connectors 68

4.9   Item Flows 71

4.10 Nested Parts and References 72

Chapter 5: Use Case Diagrams         77

5.1   Purpose 77

5.2   When Should You Create a Use Case Diagram? 77

5.3   Wait! What’s a Use Case? 78

5.4   The Use Case Diagram Frame 81

5.5   Use Cases 82

5.6   System Boundary 83

5.7   Actors 83

5.8   Associating Actors with Use Cases 84

5.9   Base Use Cases 85

5.10 Included Use Cases 85

5.11 Extending Use Cases 87

Chapter 6: Activity Diagrams         89

6.1   Purpose 89

6.2   When Should You Create an Activity Diagram? 90

6.3   The Activity Diagram Frame 90

6.4   A Word about Token Flow 92

6.5   Actions: The Basics 93

6.6   Object Nodes 95

6.7   Edges 99

6.8   Actions, Revisited 102

6.9   Control Nodes 112

6.10 Activity Partitions: Allocating Behaviors to Structures 119

Chapter 7: Sequence Diagrams         123

7.1   Purpose 123

7.2   When Should You Create a Sequence Diagram? 124

7.3   The Sequence Diagram Frame 125

7.4   Lifelines 125

7.5   Messages 129

7.6   Destruction Occurrences 138

7.7   Execution Specifications 139

7.8   Constraints 141

7.9   Combined Fragments 144

7.10 Interaction Uses 151

Chapter 8: State Machine Diagrams         155

8.1 Purpose 155

8.2 When Should You Create a State Machine Diagram? 156

8.3 The State Machine Diagram Frame 156

8.4 States 158

8.5 Transitions 162

8.6 Pseudostates 171

8.7 Regions 173

Chapter 9: Parametric Diagrams         177

9.1 Purpose 177

9.2 When Should You Create a Parametric Diagram? 178

9.3 Blocks, Revisited 179

9.4 The Parametric Diagram Frame 182

9.5 Constraint Properties 184

9.6 Constraint Parameters 185

9.7 Value Properties 185

9.8 Binding Connectors 187

Chapter 10: Package Diagrams         189

10.1 Purpose 189

10.2 When Should You Create a Package Diagram? 190

10.3 The Package Diagram Frame 190

10.4 Notations for Namespace Containment 191

10.5 Dependencies between Packages 193

10.6 Importing Packages 193

10.7 Specialized Packages 194

10.8 Shades of Gray: Are You Looking at a Package Diagram or a Block Definition Diagram? 198

Chapter 11: Requirements Diagrams         201

11.1 Purpose 201

11.2 When Should You Create a Requirements Diagram? 202

11.3 The Requirements Diagram Frame 202

11.4 Requirements 204

11.5 Requirements Relationships 205

11.6 Notations for Requirements Relationships 209

11.7 Rationale 213

Chapter 12: Allocations: Cross-Cutting Relationships          215

12.1 Purpose 215

12.2 There’s No Such Thing as an Allocation Diagram 216

12.3 Uses for Allocation Relationships 216

12.4 Notations for Allocation Relationships 219

12.5 Rationale 224

Appendix A: SysML Notation Desk Reference         227

Appendix B: Changes between SysML Versions         245

Bibliography         253

Index          255


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