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Level of Development (LOD) – AIA Definition

Purpose of LOD is to tell others what information in the model they CAN USE. Each subsequent LOD builds upon the previous LOD. CH OFFERS LOD 100 AND LOD 300 ONLY (Refer to Production Manual and/or CH BIM Protocol for detail).  LOD definitions per AIA BIM Protocol document, G202-2013, Building Information Modeling Protocol Form:

o    LOD 100 - The Model Element may be graphically represented in the Model with a symbol or other generic representation, but does not satisfy the requirements for LOD 200.

o    LOD 200 - The Model Element is graphically represented within the Model as a generic system, object, or assembly with approximate quantities, size, shape, location, and orientation.  Non-graphic information may also be attached to the Model Element.

o    LOD 300 - The Model Element is graphically represented within the Model as a specific system, object or assembly in terms of quantity, size, shape, location and orientation.  Non-graphic information may also be attached to the Model Element.

o    LOD 400 - The Model Element is graphically represented within the Model as a specific system, object or assembly in terms of size, shape, location, quantity, and orientation with detailing, fabrication, assembly, and installation information.  Non-graphic information may also be attached to the Model Element.

o    LOD 500 - The Model Element is a field verified representation in term of size, shape, location, quantity, and orientation.  Non-graphic information may also be attached to the Model Elements.

*Expanded definitions use the following interpretations:  SPECIFIC = The quantity, size, shape, location and orientation of the element as designed can be measured directly from the model without referring to non-modeled information such as notes or dimension call-outs.

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