The owner wants the BIM model to link the project cost and schedule and include sustainability features. Which BIM model type is described?

• A. BIM 4D model
• B. BIM 3D model
• C. BIM 6D model
• D. BIM 7D model

Answer: (C)

BIM dimensions extend beyond 3D to embed time, cost, and sustainability into the model. The fourth dimension adds scheduling, the fifth adds cost, and the sixth brings sustainability and lifecycle considerations into play. This question asks for a model that ties the project’s cost and its schedule together while also incorporating sustainability features. That combination is characteristic of a six-dimensional BIM model. It enables analysis that links when things happen, how much they cost, and how environmental or sustainability goals are met, allowing trade-offs and integrated planning.

A four-dimensional model would handle scheduling but not cost or sustainability. A five-dimensional model covers cost but typically not sustainability. A seven-dimensional model focuses on operation and maintenance after construction. Therefore, six-dimensional BIM best fits the need to link cost and schedule while including sustainability features.