The National Institute of Standards and Technology (NIST) Engineering Laboratory and the Office of the Secretary of Defense (OSD) hosted the third annual Model-based Enterprise and Technical Data Package (MBE/TDP) Summit from December 12 through December 15, 2011, at NIST. Over 150 participants from industry and government met to share the latest technological developments and best practices for model-based engineering (MBE), and to continue work on a new version of the MIL-STD-31000 Technical Data Package (TDP) standard 1] to include requirements for 3D models. The Department of Defense (DoD) Engineering Drawing and Modeling Working Group is responsible for updating MIL-STD-31000 to support delivery of model-based technical data for defense systems. Table 1 lists the organizations that attended the Summit.