Systems Modeling Language

Short description: General-purpose modeling language

SysML diagrams collage

The Systems Modeling Language (SysML)[1] is a general-purpose modeling language for systems engineering applications. It supports the specification, analysis, design, verification and validation of a broad range of systems and systems-of-systems.

SysML was originally developed by an open source specification project, and includes an open source license for distribution and use. SysML is defined as an extension of a subset of the Unified Modeling Language (UML) using UML's profile mechanism. The language's extensions were designed to support systems engineering activities.

## Contents

* 1 Contrast with UML
* 2 History
* 2.1 OMG SysML
* 3 Diagrams
* 4 Tools
* 4.1 Model exchange
* 5 See also
* 6 References
* 7 Further reading
* 8 External links

## Contrast with UML

SysML offers several systems engineering specific improvements over UML, which has been developed as a software modeling language. These improvements include the following:

* SysML's diagrams express system engineering concepts better due to the removal of UML's software-centric restrictions and adds two new diagram types, requirement and parametric diagrams. The former can be used for requirements engineering; the latter can be used for performance analysis and quantitative analysis. Consequent to these enhancements, SysML is able to model a wide range of systems, which may include hardware, software, information, processes, personnel, and facilities.
* SysML is a comparatively small language that is easier to learn and apply.[2] Since SysML removes many of UML's software-centric constructs, the overall language is smaller both in diagram types and total constructs.
* SysML allocation tables support common kinds of allocations. Whereas UML provides only limited support for tabular notations, SysML furnishes flexible allocation tables that support requirements allocation, functional allocation, and structural allocation. This capability facilitates automated verification and validation (V&V) and gap analysis.
* SysML model management constructs support models, views, and viewpoints. These constructs extend UML's capabilities and are architecturally aligned with IEEE-Std-1471-2000 (IEEE Recommended Practice for Architectural Description of Software Intensive Systems).

SysML reuses seven of UML 2's fourteen diagrams, and adds two diagrams (requirement and parametric diagrams) for a total of nine diagram types. SysML also supports allocation tables, a tabular format that can be dynamically derived from SysML allocation relationships. A table which compares SysML and UML 2 diagrams is available in the SysML FAQ.

Consider modeling an automotive system: with SysML one can use Requirement diagrams to efficiently capture functional, performance, and interface requirements, whereas with UML one is subject to the limitations of use case diagrams to define high-level functional requirements. Likewise, with SysML one can use Parametric diagrams to precisely define performance and quantitative constraints like maximum acceleration, minimum curb weight, and total air conditioning capacity. UML provides no straightforward mechanism to capture this sort of essential performance and quantitative information.

Concerning the rest of the automotive system, enhanced activity diagrams and state machine diagrams can be used to specify the embedded software control logic and information flows for the on-board automotive computers. Other SysML structural and behavioral diagrams can be used to model factories that build the automobiles, as well as the interfaces between the organizations that work in the factories.

## History

The SysML initiative originated in a January 2001 decision by the International Council on Systems Engineering (INCOSE) Model Driven Systems Design workgroup to customize the UML for systems engineering applications. Following this decision, INCOSE and the Object Management Group (OMG), which maintains the UML specification, jointly chartered the OMG Systems Engineering Domain Special Interest Group (SE DSIG) in July 2001. The SE DSIG, with support from INCOSE and the ISO AP 233 workgroup, developed the requirements for the modeling language, which were subsequently issued by the OMG parting in the UML for Systems Engineering Request for Proposal (UML for SE RFP; OMG document ad/03-03-41) in March 2003.[3]

In 2003 Cris Kobryn and Sanford Friedenthal organized and co-chaired the SysML Partners, an informal association of industry leaders and tool vendors,[4] which initiated an open source specification project to develop the SysML in response to the UML for Systems Engineering RFP. The original technical contributors and co-authors of the SysML 1.0a specification were Laurent Balmelli, Conrad Bock, Rick Steiner, Alan Moore and Roger Burkhart. The SysML Partners distributed their first open source SysML specification drafts in 2004, and submitted SysML 1.0a to the OMG for technology adoption in November 2005.

### OMG SysML

After a series of competing SysML specification proposals, a SysML Merge Team was proposed to the OMG in April 2006.[5] This proposal was voted upon and adopted by the OMG in July 2006 as OMG SysML, to differentiate it from the original open source specification from which it was derived. Because OMG SysML is derived from open source SysML, it also includes an open source license for distribution and use.

The OMG SysML v. 1.0 specification was issued by the OMG as an Available Specification in September 2007.[6] The current version of OMG SysML is v1.6, which was issued by the OMG in December 2019.[7] In addition, SysML was published by the International Organization for Standardization (ISO) in 2017 as a full International Standard (IS), ISO/IEC 19514:2017 (Information technology -- Object management group systems modeling language).[8]

The OMG has been working on the next generation of SysML and issued a Request for Proposals (RFP) for version 2 on December 8, 2017, following its open standardization process.[9][10] The resulting specification, which will incorporate language enhancements from experience applying the language, will include a UML profile, a metamodel, and a mapping between the profile and metamodel.[9] A second RFP for a SysML v2 Application Programming Interface (API) and Services RFP was issued in June 2018. Its aim is to enhance the interoperability of model-based systems engineering tools.

## Diagrams

SysML includes 9 types of diagram, some of which are taken from UML.

* Activity diagram
* Block definition diagram
* Internal block diagram
* Package diagram
* Parametric diagram
* Requirement diagram
* Sequence diagram
* State machine diagram
* Use case diagram

## Tools

There are several modeling tool vendors already offering SysML support, or are in the process of updating their tools to comply with the OMG SysML specification. Lists of tool vendors who support, or have announced support of, SysML or OMG SysML can be found on the SysML Forum or SysML[11] websites, respectively.

### Model exchange

As an OMG UML 2.0 profile, SysML models are designed to be exchanged using the XML Metadata Interchange (XMI) standard. In addition, architectural alignment work is underway to support the ISO 10303 (also known as STEP, the Standard for the Exchange of Product model data) AP-233 standard for exchanging and sharing information between systems engineering software applications and tools.

## See also

* SoaML
* Energy Systems Language
* Object Process Methodology
* Universal Systems Language
* List of SysML tools

## References

1. ↑ Flexible Views for View-based Model-driven Development By Burger, Erik. KIT Scientific Publishing, Nov 14, 2014. Pg. 250.
2. ↑ Embedded Systems Security. By David Kleidermacher, Mike Kleidermacher. Elsevier, 2012. Pg 180.
3. ↑ OMG SE DSIG. "UML for Systems Engineering RFP". http://syseng.omg.org/UML_for_SE_RFP.htm.
4. ↑ "SysML Partners". http://www.sysml.org/partners.htm.
5. ↑ OMG document ad/06-03-01
6. ↑ "SysML 1.0". omg.org. http://www.omg.org/spec/SysML/1.0/PDF.
7. ↑ "SysML". omg.org. https://www.omg.org/spec/SysML/1.6/.
8. ↑ "ISO/IEC 19514:2017 - Information technology -- Object management group systems modeling language (OMG SysML)" (in en). https://www.iso.org/standard/65231.html.
9. ↑ 9.0 9.1 "sysml-roadmap:sysml_v2_requirements_review_page [OMG SysML Portal"] (in en). http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-roadmap:sysml_v2_requirements_review_page.
10. ↑ "OMG Process Introduction | Object Management Group" (in en). http://www.omg.org/gettingstarted/processintro.htm.
11. ↑ "OMG SysML". omgsysml.org. http://www.omgsysml.org.

## Further reading

* Balmelli, Laurent (2007). An Overview of the Systems Modeling Language for Products and Systems Development. Journal of Object Technology, vol. 6, no. 6, July–August 2007, pp. 149-177. http://www.jot.fm/issues/issue_2007_07/article5.pdf.
* Delligatti, Lenny (2013). SysML Distilled: A Brief Guide to the Systems Modeling Language. Addison-Wesley Professional. ISBN 978-0-321-92786-6. http://www.informit.com/store/sysml-distilled-a-brief-guide-to-the-systems-modeling-9780321927866.
* Holt, Jon (2008). SysML for Systems Engineering. The Institution of Engineering and Technology. ISBN 978-0-86341-825-9. http://www.theiet.org/resources/books/computing/sysml.cfm.
* Weilkiens, Tim (2008). Systems Engineering with SysML/UML: Modeling, Analysis, Design. Morgan Kaufmann / The OMG Press. ISBN 978-0-12-374274-2. http://www.system-modeling.com.
* Friedenthal, Sanford; Moore, Alan; Steiner, Rick (2016). A Practical Guide to SysML: The Systems Modeling Language (Third ed.). Morgan Kaufmann / The OMG Press. ISBN 978-0-12-800202-5.
* Douglass, Bruce (2015). Agile Systems Engineering. Morgan Kaufmann. ISBN 978-0128021200.

## External links

* Introduction to Systems Modeling Language (SysML), Part 1 and Part 2. YouTube.
* SysML Open Source Specification Project Provides information related to SysML open source specifications, FAQ, mailing lists, and open source licenses.
* OMG SysML Website Furnishes information related to the OMG SysML specification, SysML tutorial, papers, and tool vendor information.
* Article "EE Times article on SysML (May 8, 2006)"
* SE^2 MBSE Challenge team: "Telescope Modeling"
* Paper "System Modelling Language explained" (PDF format)
* Bruce Douglass: Real-Time Agile Systems and Software Development
* List of Popular SysML Modeling Tools

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Systems Modeling Language

Actors|

* International Council on Systems Engineering
* Object Management Group
* SysML Partners
* Cris Kobryn

Concepts|

* Activity
* Actor
* Association
* Attribute
* Block diagram
* Event
* Functional flow block diagram
* Generalization
* Inheritance
* Interface
* Message passing
* Object composition
* Object-oriented analysis and design
* Package
* Parametric equation
* Profile
* State
* Use case

Other topics|

* Systems engineering
* Unified Modeling Language
* XML Metadata Interchange

* v
* t
* e

Unified Modeling Language

Actors|

* Organizations
* Object Management Group
* UML Partners
* Persons
* Grady Booch
* Ivar Jacobson
* James Rumbaugh

Concepts|

| Object oriented|

* Object-oriented programming
* Object-oriented analysis and design
* Object-oriented modeling

|

Structure|

* Actor
* Attribute
* Artifact
* Class
* Component
* Interface
* Object
* Package
* Profile diagram

Behavior|

* Activity
* Event
* Message
* Method
* State
* Use case

Relationships|

* Association
* Composition
* Dependency
* Generalization (or Inheritance)

Extensibility|

* Profile
* Stereotype

Other|

* Multiplicity

Diagrams|

| Structure|

* Class
* Component
* Composite structure
* Deployment
* Object
* Package

|

Behaviour|

* Activity
* State Machine
* Use case

Interaction|

* Communications
* Sequence
* Interaction overview
* Timing

Derived languages|

* Systems Modeling Language (SysML)
* UML eXchange Format (UXF)
* XML Metadata Interchange (XMI)
* Executable UML (xUML)

Other topics|

* Glossary of UML terms
* Rational Unified Process
* List of Unified Modeling Language tools
* Object Modeling in Color

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