SysML (like UML) is a diagramming/modeling notation. Neither of them proposes any high-level structure for documentation.
arc42 proposes ONLY a high-level documentation/communicatin structure, and is notation agnostic: I've often used it with UML, and with informal box-and-lines diagrams.
arc42 proposes ONLY a high-level documentation/communicatin structure, and is notation agnostic: I've often used it with UML, and with informal box-and-lines diagrams.