The SysML initiative is a joint effort between the OMG&#151the owners of the UML specification&#151and INCOSE&#151the systems engineering organization. The Request for Proposal (RFP) for a UML profile suitable for systems engineering was issued in March 2003 and the resulting submission effort is nearing its end. The single submission group includes both tool vendors and users (practicing systems engineers) and extends the UML 2.0 in some important ways for systems modeling and development.