This paper presents ongoing work to extend the ISO 10303-233 (AP-233) systems engineering information model in order to integrate software-engineering concepts. The work is motivated by the increasing importance of software in contemporary systems and the gap between systems and software engineering's specification methods. Encoding entities supporting modern software engineering attains two objectives. Firstly, the model could be used for exchanging software specifications in addition to system specifications. Secondly, relationships between entities representing software and system concepts can be encoded which allows for traceability between requriements expressed in a systems specification and the software design specification.
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