Welcome to SysML.org

The SysML.org web provides information, specifications, and resources related to the Systems Modeling Language (SysML) open source specification project, founded by the SysML Partners in 2003. The SysML open source specification is publicly available for download, and includes an open source license for distribution and use.

SysML is a general purpose visual 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. These systems may include hardware, software, information, processes, personnel, and facilities. The SysML Partners completed their SysML v. 1.0a open source specification draft and submitted it to the Object Management Group (OMG) in November 2005. Competing specification proposals were merged by a "SysML Merge Team" proposal submission to the OMG in April 2006, which was eventually adopted by the OMG as OMG SysML™ in July 2006.

SysML is a specified as a profile (dialect) of the Unified Modeling Language™ (UML™), the industry standard for modeling software-intensive systems, so SysML is frequently implemented as a plugin for popular UML modeling tools. During the last decade SysML has evolved into enabling technology for Model-Based Systems Engineering (MBSE), a Systems Engineering paradigm that emphasizes the application of rigorous visual modeling principles and best practices to Systems Engineering activities throughout the System Development Life Cycle (SDLC). These Systems Engineering activities include, but are not limited to, requirements analysis and verification, functional analysis and allocations, performance analysis, trade studies, and system architecture specification. For further information about MBSE and MBSE tools that use SysML check out the Model-Based Systems Engineering Forum.

You can download the most recent version of the SysML open source specification from the SysML Specifications page. See for yourself why this new visual modeling language is smaller and better suited for Model-Based Systems Engineering applications than the UML on which it is based.