Under the FIDIC Red Book (both 1999 and 2017 editions), the Employer is responsible for the design of the Works. This design is primarily communicated to the Contractor through key technical documents included in the Contract.
Option B (Specifications) is correct because Specifications define the technical requirements, standards, materials, workmanship, and performance criteria. They are a core component of the design documentation and directly guide how the Works are to be executed.
Option A (Bill of Quantities) is also correct. While primarily used for measurement and payment, the Bill of Quantities is derived from the design and reflects the quantified scope of the Works. It is intrinsically linked to the design and provides a structured breakdown of the elements required to construct the Works.
Option C is incorrect because the Breakdown of Lump-Sum is relevant to lump-sum contracts (e.g., Silver Book), not the Red Book’s remeasurement approach.
Option D is incorrect as the Schedule of Subcontractors relates to execution planning, not design.
Option E is incorrect because the Contract Agreement is a legal document formalizing the contract, not a design document.
Thus, in Red Book contracts, the design basis is fundamentally established through the Specifications and the Bill of Quantities, supported typically by Drawings (though not listed here).
