Which term covers calculations, mix designs, and analyses pertaining to a part of work?

• A. Samples
• B. Design Data
• C. Test Reports
• D. Certificates

Answer: (B)

The main idea here is a set of documentation that defines how a specific portion of the project is to be constructed, including the calculations, the concrete or asphalt mix designs, and the analyses that support those design decisions. This collection is design data. It serves as the authoritative reference for what the part of the work is supposed to be and how it should be built, guiding QA activities, reviews, and field execution. For example, design data would include the concrete mix design (ingredients, proportions, target strength, slump), as well as any structural or performance analyses and the calculations that justify dimensions, tolerances, and reinforcement—everything that shows how the portion of work will meet the design intent.

In contrast, samples are physical specimens taken from materials, test reports are the results of tests performed on materials or specimens, and certificates are official attestations of compliance or material quality. These pieces are important, but they describe executed results or attestations, not the compiled design basis and calculations that define how a portion of work is to be built.