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In March 2003, the Object Management Group (OMG) issued a request for proposals for a customised version of UML suitable for systems engineering, supporting the modelling of a broad range of systems, which may include hardware, software, data, personnel, procedures, and facilities. There was only one technology submission to the request, which was by the SysML group, proposing a language based on UML 2.0. The goal of SysML is to provide a "standard modelling language for systems engineering to analyse, specify, design, and verify complex systems, intended to enhance systems quality, improve the ability to exchange systems engineering information amongst tools, and help bridge the semantic gap between systems, software, and other engineering disciplines". The SysML specification makes it possible to model both hardware and software in the same environment using extensions to the widely used software modelling language.