Description option d is a target cost contract with a bill of quantities where the out turn financial risks are shared between the client and the contractor in an agreed proportion this document contains all the core and secondary option clauses the schedules of cost components and contract data relevant to an option d contract. nec3 engineering and construction contract option d target contract with bill of quantities nec documents uploaded by dr seuss description option d is a target cost contract with a bill of quantities where the out turn financial risks are shared between the client and the contractor in an agreed proportion this document. Option d provides for a target cost with a bill of quantities a target cost introduces a mechanism that enables the contractor and or the consultant team to share in the benefits of cost savings but also to bear some of the cost when there are cost overruns this is typically shared in a pre agreed proportion. Nec3 option d target contract with bill of quantities option d is a target cost contract with a bill of quantities where the out turn financial risks are shared between the client and the contractor in an agreed proportion this document contains all the core and secondary option clauses the schedules of cost components and contract data relevant . Nec3 engineering and construction contract ecc the nec3 engineering and construction contract is the core document from which the options a f are extracted it contains all core clauses and secondary option clauses together with the schedules of cost components and forms for contract data