The NEC has issued additional clauses to enable NEC3 to be used for early contractor involvement in the design development and construction planning stage of a project. The new wording allows the con- tractor to be appointed before details of what is to be constructed have been fully developed and priced and gives two options, one under Option C, and the other under either Options C or E.

See: https://www.neccontract.com/getmedia/ ba399179-7e32-42af-8288-a76de9fe0759/NEC_ECC_WEB.pdf.aspx