The detailed, ready-to-implement 3D model forms the core of the BIM-based working method. BIM offers outstanding potential for more efficient construction projects through better planning. The digital Building models is the central source of all information and processes and enables well-founded decisions to be made on a solid data basis.
The Level of Development (LOD describes the development status of the components of a building model. LOD provides information about the geometric level of detail of the parts of a building model in different performance phases and how reliable the Alphanumeric information of individual components in the building model is.
The American Institute of Architects (AIA) defines five basic levels from LOD 100 to LOD 400. These range from the purely conceptual or graphical representation of the model (LOD 100) to the "as-plant" execution model (LOD 400) or the work and assembly model (LOD 500). LOD thus also enables an assessment of how reliable the information in a building model is..
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The Level of Development (LOD) is fundamental for project communication and determines the degree of completeness of the model, which in turn defines the level of detail of individual model elements. The scale ranges from LOD 100 to 500, with higher numbers indicating greater detail accuracy. It is important to emphasize that LOD is not a timeframe but a measure of the level of completeness.
The Level of Geometry (LOG) refers to the geometric requirements for representing building elements and their detailing in the design model. The Level of Information (LoI) on the other hand defines the alphanumeric information requirements for the building elements.. Both are categorized independentlyin levels from 100 to 500.LoG describes the geometric content of the model, while LoI specifies the informational content of the building elements.
The LoI describes the alphanumeric information maturity level, including attributes such as materials, fire protection classes, and U-values. The LoG describes the geometric information maturity level, often specified in scale. Elements in the building model must adhere to a certain LoD (Level of Development), which depends on the project phase and discipline. The LoD is considered the sum of LoG and LoI. Additionally, the Level of Information Need (LoIN) defines the extent and granularity of the information requirements related to LoD, LoG, and LoI.