Which contracts are principal documents where the BIM addendum can be attached?

The correct choice is related to the foundational nature of governing contracts in construction projects. Governing contracts serve as the main legal framework that defines the obligations, rights, and responsibilities of the parties involved. They encompass the overall project's scope, timelines, and performance requirements, establishing a solid basis for the execution of all project elements, including Building Information Modeling (BIM) practices.

Attaching a BIM addendum to governing contracts allows for the integration of BIM-specific protocols, functions, and expectations into the overall project management framework. This ensures that all parties are on the same page regarding how BIM will be utilized, facilitating better collaboration and communication, thereby reducing potential misunderstandings and conflicts.

In contrast, the other types of contracts listed serve different purposes. Affiliated contracts might address additional relationships or agreements that support the main contract but don't establish the primary legal obligations. Termination contracts deal with the end of an agreement, and supplemental contracts add specific tasks or requirements but are not intended as the foundation for overarching project practices like BIM. Therefore, the governing contracts are the most appropriate documents for attaching a BIM addendum, as they set the essential guidelines for the project's operation, facilitating the effective incorporation of BIM methodologies.