BIM Terms Every Construction Professional Should Know in 2026

A version of this article was shared on LinkedIn by Construction Today Kenya.

Building Information Modelling (BIM) has moved from industry buzzword to baseline expectation on major construction projects. Yet the terminology surrounding it remains a source of confusion, even among professionals who work with it daily. Understanding the core terms is no longer optional.

LOD, or Level of Development, defines how much detail and reliability a BIM element carries at any given project stage. It tells the team what the model can and cannot be used for, ranging from conceptual massing through to as-built documentation. Getting LOD wrong leads to models being used for decisions they were never meant to support.

IFC, which stands for Industry Foundation Classes, is the open file format that allows BIM models to be shared across different software platforms without data loss. It is the backbone of cross-disciplinary collaboration and is particularly important on projects where the architect, engineer, and contractor use different modelling tools.

The Common Data Environment (CDE) is the single shared repository where all project information lives. The concept is straightforward: one source of truth, accessible to every stakeholder, with version control built in. In practice, many firms substitute shared drives or email folders and call it a CDE. It is not.

A BIM Execution Plan (BEP) is the project's BIM roadmap. It sets out who is responsible for what, which software will be used, how information will be structured, and at what stages models will be delivered. A project without a BEP is running BIM without a plan.

PIM and AIM refer to the Project Information Model and the Asset Information Model respectively. The PIM covers everything produced during design and construction. The AIM takes over at handover, carrying the data that facilities managers need to operate and maintain the building throughout its life. The distinction matters because most of the long-term value of BIM sits in the AIM, yet it is frequently underdeveloped or ignored entirely.

ISO 19650 is the international standard for managing information over the whole life cycle of a built asset using BIM. It provides the framework within which all of the above operate. Compliance with ISO 19650 is increasingly a procurement requirement on public sector projects in the United Kingdom, and its adoption is growing across East Africa as international contractors bring it into local projects.

Beyond these core terms, the BIM ecosystem includes coordination processes such as clash detection, where the model is interrogated to find conflicts between different building systems before they become expensive on-site problems.