Building information modeling

Building information modeling (BIM) is a digital process for creating and managing coordinated information about a built asset across its life cycle. It links a model’s geometry with data used in design, construction, and operation.

Parametric modeling: A modeling approach in which geometry and other properties are defined by parameters and relationships. BIM objects can update when parameters or related design elements change.
Clash detection: The identification of spatial conflicts between elements in coordinated digital models. BIM coordination can reveal conflicts among building systems before construction.
Computer-aided design: The use of computers to create, modify, analyze, or optimize designs. BIM developed from computer-aided design but adds coordinated object information and life-cycle processes.
Integrated project delivery: A project delivery method that aligns key participants through collaborative processes and shared goals. BIM can support the early collaboration and shared information used in integrated delivery.
Common data environment: A shared digital environment for collecting, managing, and distributing project information. A CDE organizes model files, documents, and revisions for a BIM project.
Quantity takeoff: The process of measuring material quantities from project drawings or models for estimating and procurement. BIM object data can support quantity extraction and cost estimates.
Ivan Sutherland: An American computer scientist whose Sketchpad system pioneered interactive computer graphics. Sketchpad demonstrated interactive graphical modeling decades before BIM became practical.
BuildingSMART: An international organization that develops open standards and guidance for digital construction and asset information. Its work addresses interoperability challenges created by multi-party digital projects.
Level of information need: A specification of the information and detail required for a defined purpose and project stage. It sets what BIM deliverables should contain without demanding unnecessary detail.
Construction sequencing: The planning of construction activities in the order and timing required to complete a project. Linking model elements to schedule activities creates a time-based construction simulation.

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