What exactly is BIM—a model, a technology, or something else? How can we better understand BIM? Let me offer some clarity by breaking it down into four levels.
First Level — The Principle. This is the foundational idea behind BIM. Over 30 years ago, Charlie Eastman published the first article outlining what we now recognize as BIM theory. At that time, personal computers were not yet widespread, and the concepts were based on books and laboratory research. Nevertheless, these early theories have shaped the development of related technologies and systems for decades. Eastman described BIM as operating on a database-driven model that can generate plans, elevations, sections, and perspective views. Any modification made to one part of the model automatically updates all related drawings instantly. Since then, the industry has followed this vision, striving for data sharing, interoperability, and full lifecycle application of construction data. Although these ideals have not been fully realized to date—and likely won’t be in the near future—they continue to guide research efforts and software development in the field.
Second Level — Methodology. To achieve BIM’s ideals, a set of methodologies must be established. Over the past decade or two, various approaches have been proposed and tested. Some have proven effective, while others have failed in practice. For example, to enable data sharing throughout the building lifecycle, there needs to be a platform and standards capable of translating data between different BIM software tools. The Industry Foundation Classes (IFC), developed by buildingSMART, is one such standard. Its purpose is to create a common information model so that regardless of the software used, models can be exported in a unified format. This allows anyone to continue working on a model saved in IFC format, somewhat akin to how many programs can open a standard 2D graphic file. However, sharing 3D information models is more complex, making this a challenging goal. Additionally, the concept of a “single model”—where design, construction, operation, maintenance, and developers collaborate on one BIM file—was once pursued to enable seamless data sharing. However, this approach has proven impractical over time and is no longer considered part of current BIM methodologies. Other national BIM standards, strategic plans, and guidelines also fall under this level.
Third Level — Management. This level involves operational, managerial, policy, and legal issues, whether within an organization or across the industry. For example, the failure of the “single building model” concept demonstrates that theoretical methods must be validated through practice. Implementing these methods raises business, legal, and managerial challenges. Organizations of all sizes face obstacles when adopting BIM, often related to existing business models and applicable legal frameworks, which may sometimes conflict. Addressing these contradictions is essential before BIM implementation. Both BIM projects and enterprise-wide BIM adoption require a clear BIM implementation strategy. Since BIM fundamentally transforms traditional business models—impacting costs, contracts, schedules, personnel management, and data sharing regulations—issues related to current policies and management must be carefully considered at this level.
In the United States, federal agencies such as the General Services Administration, Department of Defense, Army, Navy, and Department of Veterans Affairs have dedicated BIM research and implementation teams, along with related standards. At the state and local levels, government bodies in places like Texas and Ohio have made BIM mandatory for construction projects, requiring participants to adopt BIM practices. Many universities also offer BIM-related courses and maintain specialized research groups in this field.
Fourth Level — Implementation. This is the most tangible level, focusing on managing BIM projects and applying technical tools. It involves decisions about team composition, training, role assignments, and software platform choices. Whether it’s a single-industry BIM project or a cross-industry collaboration such as Integrated Project Delivery (IPD), the personnel and collaboration methods differ significantly from traditional approaches. BIM project management varies depending on industry sectors—design, construction, or operation and maintenance—each with its specific management practices.
Have these four levels helped you gain new insights into BIM? In reality, most people involved with BIM focus on only one or two of these levels. For instance, a project leader at a design firm usually deals primarily with fourth-level issues. Meanwhile, business decision-makers tend to focus more on third-level concerns, occasionally also addressing some fourth-level aspects.
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