BIMForum has unveiled the Level of Development Specification, a BIM deliverable document, Jeffrey Yoders writes. Working with the American Institute of Architects, the standard adds more context to the AIA G202-2013 definitions for levels 100, 200, 300, and 400. It also added a new level -- 350 -- for trade coordination. "The LOD Specification is not prescribing a particular progression or approach for creating models," said Jan Reinhardt, principal at Adept Project Delivery and co-chair of the LOD committee. "It only provides clear language for communicating, describing and agreeing on a progression and quality of a model that is specific for a particular project."