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{{Short description|General-purpose modeling language}}
[[File:Sysml diagrams collage.jpg|thumb|240px|SysmlSysML diagrams collage]]
The '''Systemssystems Modelingmodeling Languagelanguage''' ('''SysML''')<ref>''Flexible Views for View-based Model-driven Development'' By Burger, Erik. KIT Scientific Publishing, Nov 14, 2014. Pg. 250.</ref> 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 [[System of systems|systems-of-systems]].
 
SysML was originally developed by an [[open source]] specification project, and includes an open source license for distribution and use.<ref name="faq">{{citeCite web|author=SysML Forum|title=SysML FAQOpen Source Project: What is SysML? Who created it? |url=https://sysmlforumsysml.com/sysml-faqorg/index.html |accessdateaccess-date=2018-122023-03-28 |website=SysML.org |language=en}}</ref> SysML is defined as an extension of a subset of the [[Unified Modeling Language]] (UML) using [[profile (UML)|UML's profile mechanism]]. The language's extensions were designed to support systems engineering activities.
 
== Contrast with UML ==
SysML offers several systems engineersengineering several noteworthyspecific improvements over [[Unified Modelling Language|UML]], which tendshas tobeen bedeveloped as a software-centric modeling language. These improvements include the following:<ref name="faq"/>
 
* SysML's semanticsdiagrams areexpress moresystem flexibleengineering andconcepts expressive.better SysMLdue reducesto 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 [[Profiling (computer programming)|performance analysis]] and [[Statistics|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 littlesmall language that is easier to learn and apply.<ref>Embedded Systems Security. By David Kleidermacher, Mike Kleidermacher. Elsevier, 2012. Pg 180.</ref> Since SysML removes many of UML's software-centric constructs, the overall language measuresis 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 "[[nominative]]" types of [[diagram]]s,<ref>{{cite book
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.<ref>{{cite web|url=http://www.sysmlforum.com/faq/|title=SysML Forum: SysML FAQ - What is SysML?, Why use SysML?, Who created SysML?|work=sysmlforum.com|accessdate=2014-12-04}}</ref>▼
|chapter=Annex A: Diagrams (normative)
|title=Unified Modeling Language 2.5.1
|series=[[Object Management Group |OMG]] Document Number formal/2017-12-05
|date=December 2017
|publisher=[[Object Management Group]] Standards Development Organization (OMG SDO)
|page=683
|url=https://www.omg.org/spec/UML/2.5.1/PDF
}}
</ref>
▲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.<ref>{{cite web|url=http://www.sysmlforum.com/faq/|title=SysML Forum: SysML FAQ - What is SysML?, Why use SysML?, Who created SysML?|work=sysmlforum.com|accessdate=2014-12-04}}</ref>
 
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 diagram]]s 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.
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== History ==
The SysML initiative originated in a January 2001 decision by the [[INCOSE|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 10303|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.<ref name="rfp">{{cite web|authorwebsite=OMG SE DSIG|title=UML for Systems Engineering RFP|url=http://syseng.omg.org/UML_for_SE_RFP.htm|accessdateaccess-date=2006-06-29 |url-status=dead |archive-url=https://web.archive.org/web/20061012011253/http://syseng.omg.org/UML_for_SE_RFP.htm |archive-date= Oct 12, 2006 }}</ref>
 
In 2003 David Oliver and Sanford Friedenthal of INCOSE requested that [[Cris Kobryn]], who successfully led the UML 1 and UML 2 language design teams, lead their joint effort to respond to the UML for SE RFP.<ref name=":1">{{Cite web |title=SysML Partners: Creators of the SysML |url=https://sysml.org/sysml-partners/index.html |access-date=2023-03-28 |website=SysML.org |language=en |url-status=live |archive-url=https://web.archive.org/web/20221018204237/https://sysml.org/sysml-partners/index.html |archive-date= Oct 18, 2022 }}</ref> As Chair of the SysML Partners, Kobryn coined the language name "SysML" (short for "Systems Modeling Language"), designed the original SysML logo, and organized the SysML Language Design team as an open source specification project.<ref>{{Cite web |title=SysML FAQ: Who created SysML and how did it get its name? |url=https://sysml.org/sysml-faq//sysml-faq/who-created-sysml.html |access-date=2023-03-28 |website=SysML.org |language=en}}{{dead link|date=April 2024}}</ref> Friedenthal served as Deputy Chair, and helped organize the original SysML Partners team.
 
In January 2005, the SysML Partners published the SysML v0.9 draft specification. Later, in August 2005, Friedenthal and several other original SysML Partners left to establish a competing SysML Submission Team (SST).<ref name=":1" /> The SysML Partners released the SysML v1.0 Alpha specification in November 2005.
In 2003 [[Cris Kobryn]] and Sanford Friedenthal organized and co-chaired the [[SysML Partners]], an informal association of industry leaders and tool vendors,<ref>{{cite web|url=http://www.sysml.org/partners.htm|title=SysML Partners|accessdate=2006-06-29}}</ref> which initiated an open source specification project to develop the SysML in response to the UML for Systems Engineering RFP.<ref name="sysml faq">{{cite web|author=SysML Forum|title=SysML FAQ|url=http://www.sysmlforum.com/faq.htm|accessdate=2006-06-29 |archiveurl = https://web.archive.org/web/20060716231947/http://www.sysmlforum.com/faq.htm <!-- Bot retrieved archive --> |archivedate = 2006-07-16}}</ref> 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.<ref>[http://www.omg.org/docs/ad/06-03-01.pdf OMG document ad/06-03-01] {{Webarchive|url=https://web.archive.org/web/20081201130201/http://www.omg.org/docs/ad/06-03-01.pdf |date=2008-12-01 }}</ref> 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.<ref>{{cite web|url=http://www.omg.org/spec/SysML/1.0/PDF|title=SysMLOMG 1Systems Modeling Language (OMG SysML™), V1.0 |date=September 2007 |work=omg.orgObject Management Group|accessdateaccess-date=2014-12-04}}</ref> The current version of OMG SysML is v1.56, which was issued by the OMG in MayDecember 20172019.<ref>{{cite web|url = httphttps://www.omg.org/spec/SysML/1.56/|title = SysMLAbout the OMG Systems Modeling Language Specification Version 1.6 |work =Object omg.orgManagement Group|accessdateaccess-date = 20172020-0701-0314}}</ref> In addition, SysML was published by the [[International Organization for Standardization]] (ISO) in 2017 as a full [[International standard|International Standard]] (IS), ISO/IEC 19514:2017 (Information technology -- Object management group systems modeling language).<ref>{{Cite web|url=https://www.iso.org/standard/65231.html|title=ISO/IEC 19514:2017 - Information technology -- Object management group systems modeling language (OMG SysML)|website=www.iso.orgISO |language=en|access-date=2017-12-29}}</ref>
 
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.<ref name=":0">{{Cite web|url=http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-roadmap:sysml_v2_requirements_review_page|title=sysml-roadmap:sysml_v2_requirements_review_page [OMG SysML Portal]|website=www.omgwiki.orgOMG Wiki |language=en|access-date=2017-12-29}}</ref><ref>{{Cite web|url=http://www.omg.org/gettingstarted/processintro.htm|title=OMG Process Introduction {{!}} |website=Object Management Group|last=http://themeforest.net/user/dan_fisher|website=www.omg.org |language=en|access-date=2017-12-29}}</ref> The resulting specification, which will incorporate language enhancements from experience applying the language, will include a UML profile, a [[Metamodeling|metamodel]], and a mapping between the profile and metamodel.<ref name=":0" /> A second RFP for a SysML v2 [[Application programming interface|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 [[Unified Modelling Language|UML]].
 
* [[Activity diagram]]▼
* [[Block definition diagram]]
* [[Internal block diagram]]
* [[Package diagram]]
* [[Use caseParametric diagram]]
* [[Requirement Diagramdiagram]]
▲* [[Activity diagram]]
* [[Sequence diagram]]
* [[State machine diagram]]
* [[ParametricUse 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<ref>{{cite web|url=httphttps://www.SysMLforumsysmlforum.com/sysml-tools/|title=SysMLCommercial, Forum:Free What& isOpen Source SysML? - What You NeedTools tofor KnowMBSE|work=sysmlforum.com|accessdateaccess-date=20142024-1205-0407}}</ref> or SysML<ref>{{cite web|url=http://www.omgsysml.org|title=OMG SysML|work=omgsysml.org|accessdateaccess-date=2014-12-04}}</ref> websites, respectively.
 
=== Model exchange ===
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== See also ==
* [[SoaML]]
* [[Energy Systemssystems Languagelanguage]]
* [[Object Processprocess Methodologymethodology]]
* [[Universal Systems Language]]
* [[List of SysML tools]]
 
== References ==
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| title = Systems Engineering with SysML/UML: Modeling, Analysis, Design
| publisher = Morgan Kaufmann / The OMG Press
| isbn=978-0-12-374274-92
}}
* {{cite book
| title = A Practical Guide to SysML: The Systems Modeling Language
| lastlast1 = Friedenthal
| firstfirst1= Sanford
|last2=Moore|first2=Alan|last3=Steiner|first3=Rick| publisher = Morgan Kaufmann / The OMG Press
| year = 2016
| isbn=978-0-12-800202-5
|edition=Third}}
* {{cite book
| first= Bruce
| last = Douglass
| year = 2015
| title = Agile Systems Engineering
| publisher = Morgan Kaufmann
| isbn=978-0128021200
}}
 
== External links ==
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* SE^2 MBSE Challenge team: "[http://mbse.gfse.de Telescope Modeling]"
* Paper "[http://www.omgsysml.org/SysML_Modelling_Language_explained-finance.pdf System Modelling Language explained]" (PDF format)
*[https://www.bruce-douglass.com Bruce Douglass: Real-Time Agile Systems and Software Development]
* [httphttps://model-based-systems-engineeringmbse4u.com/sysml-v2-tools/ List of Popular SysML Modeling Tools]
 
{{Systems Engineering}}
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