1. Systems Modeling Language (SysML) Overview
April 20, 2005
Sanford Friedenthal
SysML Cochair
(703)

2. SE Practices for Describing Systems
Future
Past
Specifications
Interface requirements
System design
Analysis & Trade-off
Test plans
Moving from Document centric to Model centric

3. Why Model Based Approach ?
Improved communications
Reduced ambiguity
Reduced errors
More complete representation
Enhanced knowledge capture

4. Unified Modeling Language (UML)
Is a visual modeling language
Is not a methodology
Defacto standard for SW level OO modeling
Visual Modeling Language = Notation + Semantics
Semantics = meaning
Notation = representation of meaning

5. UML/SysML Status
UML V2.0
Updated version of UML that offers significant capability for systems engineering over previous versions
Adopted in June 2003/Finalized in 2005
UML for Systems Engineering (SE) RFP
Established the requirements for a system modeling language
Issued by the OMG in March 2003
SysML
Industry Response to the UML for SE RFP
Addresses most of the requirements in the RFP
V1.0 expected to begin adoption in 2005

6. SysML Partners Industry
American Systems, BAE SYSTEMS, Boeing, Deere & Company, EADS Astrium, Eurostep, Israel Aircraft Industries, Lockheed Martin, Motorola, Northrop Grumman, oose.de, Raytheon, THALES
Government
DoD/OSD, NASA/JPL, NIST
Vendors
Artisan, Ceira, EmbeddedPlus, Gentleware, IBM, I-Logix, PivotPoint Technology, Popkin, Project Technology, 3SL, Telelogic, Vitech
Liaisons/Other Organizations
AP-233, CCSDS, EAST, INCOSE, Rosetta

7. SysML Scope Development Life Cycle System Hierarchy
Systems Engineering
Process, Methods, & Artifacts
Customer
Req’ts
System
Solutions
Req’ts
Analysis
Arch
Design
Eval
Altern
Verify &
Validate
SoS
Applies to
Each Level of the System Hierarchy
System
System
System
System
Hierarchy
Subsystem
Subsystem
Component Specific Methods (e.g. HW, SW)
Item 1
Item N
Item 1
Item N

8. SysML Diagram Taxonomy
Derived from UML 2
Composite Structure

9. A Few Sample Diagrams

10. Assemblies, Parts, Ports, Connectors & Flows
Assembly
Item Flow
Port
Connector

11. Continuous Systems r e v i r D m e k e a t s r y B S S B A « » « »
interruptibleRegion r e v
Driving i r
Turn D
Key On
« continuous »
Brake
Pressure e m k e a t r s
Braking B y
ControlOperator S
Enable on Brake
Pressure > 0
« continuous »
Modulation
Frequency S B A
Monitor Traction

12. Sequence Diagram with Reference
Continue
seq:
Question :A :B :C :A :B
ask
ref
Question
alt
DoSth
alt ok ok
yes
nonono
notOK
notOK no
Derived from UML 2 Superstructure

13. State Machine Diagram

14. Requirement Diagram Showing Requirements Flowdown

15. Related Standards Efforts

16. Standard UML Profile for DoDAF
Recent initiative started through the OMG
Purpose
Develop standard representations of DoDAF products using UML/SysML
Benefits
Improved communications
Architecture model reuse and maintainability
Model interoperability among tools
OMG Timeline
Plan to issue req’ts for the standard in late ’05 or early ‘06

17. SysML / AP-233 Alignment SysMLTools Systems Engineering Electrical CAE
Engineering Analysis
ISO 10303/AP-233
NEUTRAL SE
DATA EXCHANGE
FORMAT
Mechanical
CAD
Algorithm
Design
SW Dev
Environment
Planning
Tools
Testing
Tools

18. Systems Engineering Standards & Architecture Frameworks
Implemented
by Tools
Modeling Methods
SADT HP
OOSE
Other
Interchange Standards
MOF/XMI
STEP/AP-233
Architecture Frameworks
FEAF
Zachman FW
DoDAF
MDA
Modeling & Simulation
Standards
UML/SysML
IDEF0
HLA
Modeling
Simulation
Process
EIA 632
CMMI *
ISO 15288
IEEE 1220
DoDAF
UML/SysML
MOF/XMI
STEP/AP-233
CADM

19. Summary
SysML is a general purpose language that supports the specification, analysis, design, & verification of complex systems
SysML is being developed in conjunction with related systems engineering and architecture framework standards
Part of the OMG Model Driven Architecture Standards
ISO AP-233 data interchange standard
UML Profile for DoDAF initiative
Planned adoption of SysML v1.0 to begin end of 2005

20. References UML for SE RFP OMG doc# ad/03-03-41
SysML V0.9 (refer to
OMG Doc # ad/
[UML2 2003] UML 2 Superstructure (Final Adopted Specification)
OMG doc# ptc/
[UML2 2003] UML 2 Infrastructure (Final Adopted Specification)
OMG doc# ptc/
INCOSE 2004 Symposium Paper “Extending UML to Support a Systems Modeling Language” – S. Friedenthal, C. Kobryn
INCOSE 2003 Symposium Paper “Extending UML from Software to Systems” – S. Friedenthal, R. Burkhart
INCOSE Insight (June 2004)
[Bock 2003] "UML 2 Activity Model Support for Systems Engineering Functional Flow Diagrams," Journal of INCOSE Systems Engineering, vol. 6, no. 4, October 2003 – C. Bock

21. Further Info
Web
Chairs
Cris Kobryn
Sandy Friedenthal