SysML

SysML, short for Systems Modeling Language, is a general-purpose modeling language for systems engineering. It is a dialect of UML 2.x developed by the Object Management Group (OMG) with input from INCOSE and industry practitioners. SysML supports the specification, analysis, design, verification, and validation of complex systems that may combine hardware, software, information, procedures, and personnel.

SysML extends UML with constructs to model requirements, structure, behavior, and parametric constraints. It supports four modeling views: structure with blocks and ports; behavior with use cases, activities, state machines, and sequences; requirements diagrams for traceability; and parametric diagrams for engineering analysis. It enables allocation of requirements to design elements and provides cross-cut traceability from needs through implementation and verification.

Key diagram types include block definition diagrams and internal block diagrams for structure, use case diagrams, activity diagrams, sequence and state diagrams for behavior, requirement diagrams, and parametric diagrams. Package diagrams and allocation relationships help organize models and map requirements to architecture and components.

SysML is used in model-based systems engineering (MBSE) across aerospace, defense, automotive, and industrial domains to improve communication, maintain traceability, and support verification and validation. The language is maintained by OMG, with ongoing revisions and ecosystem tooling that integrates with simulations, requirements management, and lifecycle processes.