As 2023 marks the 10th anniversary of the BIMForum Level of Development Specification the BIMForum
Working Group Advisory Board decided that it was time for a major review and update, so the LOD Working
Group will not be adding any new content for 2022 and the 2021 version of the LOD Spec will remain the
current version until the 2023 version is published.
The purpose of the update is not to make any changes in model element requirements, but rather to resolve
any conflicts and to improve consistency and readability in the logic and format of text and graphics.
The purpose of this Supplement to the 2021 version is to introduce the updated LOD definitions developed in
2022. In general the new definitions are the previous (2013) AIA definitions with the BIMForum
Interpretations incorporated, so the interpretations of building systems and components at various
LODs included in the 2013 through 2021 versions of the LOD Spec are applicable to the new
definitions without change
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