4.1          Level of Development

BIM technology enables the BIM model to contain geometrical and non- geometrical information as BIM elements. Geometrical information includes size, volume, location, orientation, etc. while non-geometrical information includes specifications, performance data, cost, etc.

BD notices various international organisations attempting to standardise BIM elements. One of the popular standards is the “Level of Development” (LOD), according to the American Institute of Architect. The LOD is classified into six categories namely LOD 100, LOD 200, LOD 300, LOD 350, LOD 400 and LOD

500. Reference on the LOD classification and specification may refer to https://bimforum.org/ . As a general principle, APs are advised to adopt LOD 300 in the preparation of BIM files though on some occasions APs may adopt LOD below 300 (e.g. indication of E/M plants, exhausted ducts) or LOD above 300 (e.g. special design details).