the OMG Systems Modeling Language (OMG SysML) is a general-purpose modeling language for systems engineering applications.SysML supports the specification, analysis, design, verification and validation of a broad range of complex systems. These systems may include hardware, software, information, processes, personnel, and facilities.
The origins of the SysML initiative can be traced to a strategic decision by the International Council on Systems Engineering’s (INCOSE) Model Driven Systems Design workgroup in January 2001 to customize the Unified Modeling Language (UML) for systems engineering applications.
Currently it is common practice for systems engineers to use a wide range of modeling languages, tools and techniques on large systems projects. In a manner similar to how UML unified the modeling languages used in the software industry, SysML is intended to unify the diverse modeling languages currently used by systems engineers.
SysML reuses a subset of UML 2.1 and provides additional extensions needed to address the requirements in the UML for System Engineering.

گزیده:

Do you know that place between being asleep and awake, where you still remember your dreams? Thats where I'll always love, that's where I'll always wait for you. 
- Tinkerbell (Hook)