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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 [[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 small 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 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.
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