BIMForum has published a LOD Specification Document that aims to clarify the level of Development of each model element according to the LOD 100-200-300-350-400 scale.Català - Castellano - Deutsch
A DRAFT of the Level of Development Specification has been published here at the BIMForum website. The Specification has been developed under supervision of people from the AIA and the AGC, and consultants from General Contractors, Architecture offices, Structural Engineering firms have been part of it too (see the aknowledgement on page 6). One of the main points that the document wants to clarify is that "there is no such a thing as a LOD XXX Model" but there are LOD for each element or assembly.
It will definitely be a good reference document to have in hand when modeling.
