ISO/AWI TS 7817-2
Building information modelling — Level of information need — Part 2: Guidance for application
Reference number
ISO/AWI TS 7817-2
Версия 1
Working draft
ISO/AWI TS 7817-2
Проект данного международного стандарта был подготовлен рабочей группой.


This document defines how level of information need can be implemented in projects and programmes. It further clarifies how to state the prerequisites, as defined in Part 1 (EN 17412-1, ISO 7817-1) and then elaborates a methodology on how to specify information requirements for geometrical information, alphanumerical information and documentation, in line with the concepts and principles from Part 1. Part 2 includes various examples and diagrams to help the information receiver understand the extent of their requirements specification, mainly using plain-language and a series of decision trees. This is illustrated with examples from building and infrastructure projects and is not limited by classification systems, software tools, exchange formats or data schemas. It also provides a few tabular templates, which help expressing the level of information need using traditional text and spreadsheet formats, in line with current industry practice. However, the ambition is to present the requirements in a structured way, allowing to specify the level of information need consistently across the international market. The structured approach will form the basis to develop a machine-interpretable exchange data schema to capture level of information need specifications, which is the subject of Part 3 of the standard. In addition, Part 2 describes suggestions and approaches for defining a nomenclature and it expands on verification and validation aspects as defined in Part 1. Part 2 supports the verification and validation of information deliverables against the information requirements expressed in the level of information need. Validation against design requirements, building code, regulations or building programme are not the scope of Part 2. Also, information model exchange and related data exchange formats are not within scope. Finally, Part 2 relates the level of information need to the elaboration of Exchange Information Requirements (EIR), BIM Execution Plan (BEP) according to ISO 19650 and explains how it relates to ISO 29481 Information Delivery Manual (IDM) and ISO 16739-1 Industry Foundation Classes (IFC).

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