SysML Distilled : A Brief Guide to the Systems Modeling Language

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 Contents 12 Foreword 18 Foreword 20 Preface 26 Acknowledgments 32 About the Author 34 Chapter 1 Overview of Model-Based Systems Engineering 36 1.1 What Is MBSE? 37 1.2 The Three Pillars of MBSE 39 1.3 The Myth of MBSE 44 Chapter 2 Overview of the Systems Modeling Language 46 2.1 What SysML Is—and Isn’t 46 2.2 Yes, SysML Is Based on UML—but You Can Start with SysML 48 2.3 SysML Diagram Overview 49 2.4 General Diagram Concepts 52 Chapter 3 Block Definition Diagrams 58 3.1 Purpose 58 3.2 When Should You Create a BDD? 59 3.3 The BDD Frame 59 3.4 Blocks 61 3.5 Associations: Another Notation for a Property 79 3.6 Generalizations 84 3.7 Dependencies 87 3.8 Actors 88 3.9 Value Types 90 3.10 Constraint Blocks 92 3.11 Comments 94 Chapter 4 Internal Block Diagrams 98 4.1 Purpose 98 4.2 When Should You Create an IBD? 99 4.3 Blocks, Revisited 99 4.4 The IBD Frame 100 4.5 BDDs and IBDs: Complementary Views of a Block 101 4.6 Part Properties 102 4.7 Reference Properties 102 4.8 Connectors 103 4.9 Item Flows 106 4.10 Nested Parts and References 107 Chapter 5 Use Case Diagrams 112 5.1 Purpose 112 5.2 When Should You Create a Use Case Diagram? 112 5.3 Wait! What’s a Use Case? 113 5.4 The Use Case Diagram Frame 116 5.5 Use Cases 117 5.6 System Boundary 118 5.7 Actors 118 5.8 Associating Actors with Use Cases 119 5.9 Base Use Cases 120 5.10 Included Use Cases 120 5.11 Extending Use Cases 122 Chapter 6 Activity Diagrams 124 6.1 Purpose 124 6.2 When Should You Create an Activity Diagram? 125 6.3 The Activity Diagram Frame 125 6.4 A Word about Token Flow 127 6.5 Actions: The Basics 128 6.6 Object Nodes 130 6.7 Edges 134 6.8 Actions, Revisited 137 6.9 Control Nodes 147 6.10 Activity Partitions: Allocating Behaviors to Structures 154 Chapter 7 Sequence Diagrams 158 7.1 Purpose 158 7.2 When Should You Create a Sequence Diagram? 159 7.3 The Sequence Diagram Frame 160 7.4 Lifelines 160 7.5 Messages 164 7.6 Destruction Occurrences 173 7.7 Execution Specifications 174 7.8 Constraints 176 7.9 Combined Fragments 179 7.10 Interaction Uses 186 Chapter 8 State Machine Diagrams 190 8.1 Purpose 190 8.2 When Should You Create a State Machine Diagram? 191 8.3 The State Machine Diagram Frame 191 8.4 States 193 8.5 Transitions 197 8.6 Pseudostates 206 8.7 Regions 208 Chapter 9 Parametric Diagrams 212 9.1 Purpose 212 9.2 When Should You Create a Parametric Diagram? 213 9.3 Blocks, Revisited 214 9.4 The Parametric Diagram Frame 217 9.5 Constraint Properties 219 9.6 Constraint Parameters 220 9.7 Value Properties 220 9.8 Binding Connectors 222 Chapter 10 Package Diagrams 224 10.1 Purpose 224 10.2 When Should You Create a Package Diagram? 225 10.3 The Package Diagram Frame 225 10.4 Notations for Namespace Containment 226 10.5 Dependencies between Packages 228 10.6 Importing Packages 228 10.7 Specialized Packages 229 10.8 Shades of Gray: Are You Looking at a Package Diagram or a Block Definition Diagram? 233 Chapter 11 Requirements Diagrams 236 11.1 Purpose 236 11.2 When Should You Create a Requirements Diagram? 237 11.3 The Requirements Diagram Frame 237 11.4 Requirements 239 11.5 Requirements Relationships 240 11.6 Notations for Requirements Relationships 244 11.7 Rationale 248 Chapter 12 Allocations: Cross-Cutting Relationships 250 12.1 Purpose 250 12.2 There’s No Such Thing as an Allocation Diagram 251 12.3 Uses for Allocation Relationships 251 12.4 Notations for Allocation Relationships 254 12.5 Rationale 259 Appendix A: SysML Notation Desk Reference 262 Appendix B: Changes between SysML Versions 280 Bibliography 288 Index 290 A 290 B 291 C 291 D 292 E 293 F 293 G 294 H 294 I 294 J 295 L 295 M 295 N 295 O 296 P 296 Q 297 R 297 S 298 T 299 U 299 V 300 W 300 X 300 "SysML Distilled is a go-to reference for everyone who wants to start creating accurate and useful system models with SysML. Drawing on his pioneering experience creating models for Lockheed Martin and NASA, Lenny Delligatti illuminates SysMLs core components, and shows how to use them even under tight deadlines and other constraints. The reader neednt know all of SysML to create effective models: SysML Distilled quickly teaches what does need to be known, and helps deepen the reader's knowledge incrementally as the need arises."-- Publisher's website