What does a combination specification incorporate?

A combination specification effectively merges various elements to ensure that the project's requirements are met comprehensively. Specifically, it incorporates both performance specifications, which outline the required outcomes or performance criteria, and proprietary specifications, which identify specific products or materials that must be used in the project.

This blend allows for greater flexibility and ensures that the contractor or builder can achieve desired results while also adhering to specific product requirements. By utilizing a mix of performance and proprietary components, the specification can clearly define expectations for both functionality and product quality, creating a well-rounded guideline for construction projects.

The other options provided do not capture the essence of what a combination specification entails. Solely including proprietary items or just general requirements would limit the specification's effectiveness, while exclusive descriptions without brand names would eliminate the specificity needed for certain critical project components.