DIN EN 17412-1:2021

Building Information Modelling - Level of Information Need - Part 1: Concepts and principles; German version EN 17412-1:2020

This document specifies the methodology to describe the Levels of Definitions of BIM deliveries throughout the life-cycle of the built asset. Such definitions are important to define the required amount of information (geometrically and alpha-numerically) that has to be provides by a BIM delivery to be mature enough for its anticipated use. Often such definitions are part of BIM Guidelines or Contract amendments and there is a need that they are defined in a common and comparable way to allow BIM services to be procured and offered on a European scale.The work item unambiguously defines the terms used within the methodology with a focuson Level of Definition (LOD), Level of Geometry (LOG) and Level of Information (LOI) to describe the state of definition of Model Elements (ME) in Building Information Models (BIM). It establishes a common way to label the different levels, here in particular the Levels of Geometry and Levels of Information, according to a naming scheme, such as numeric as 1-5, or 100-500, or alphanumeric, such as A-E, or by a combination of both.It provides a guidance on how the different Levels of Definition relate to the life cycle phases of built assets and in particular how the Level of Information relate to the different BIM usages. A clarification is made that LOD's relate to Model Elements and not complete Building Information Models.This document will also clarify how far a common European definition can be agreed upon and when further detailing has to occur within each member state. The latter may relate to the existing and establish national classification systems and plan of works.