After two years of dedication and hard work, the first draft of the BIM Level of Development (LOD) Specification is finally available for public comment. The work group responsible for this important document is a joint task force consisting of members of the AIA and the AGC of America’s BIMForum.
You might be asking, ‘what is an LOD Specification and why do I need one?’ The AIA’s digital practice documents defines 5 fundamental levels of model development, but offers only general definitions of what each level means. I offered some explanation of these in an older blog post.
This new document offers more detailed definitions of how model authors must create virtual components in order to satisfy the requisite reliability. Building upon the AIA’s original LOD definitions, the LOD Specification can be seen as a companion document – much the same way as a dictionary can be a companion to both an author and a reader.
The public comment period will be completed by early June 2013, but the work group will continue to revise the LOD Specification and publish it on an annual basis. Go to bimforum.org/lod to download your free copy today. You can also read a very detailed article about it by work group chair Jim Bedrick on the AECBytes website (“Level of Development Specification for BIM Processes”).