  The purpose of this symposium, held in conjunction with MoDELS 2006, was to
present the current state of research of the UML 2 Semantics Project. Equally
important to receiving feedback from an audience of experts was the opportunity
to invite researchers in the field to discuss their own work related to a
formal semantics for the Unified Modeling Language. This symposium is a
follow-on to our first workshop, held in conjunction with ECMDA 2005.
