In such cases the contractor may take full responsibility for their performance, or the contractor's responsibility may be limited in some way, in which case a collateral warranty between client and subcontractor will be essential.
In some cases the client will appoint some of the sub-contractors to be engaged by the contractor (variously referred to as named, nominated, or pre-selected). The responsibility of the latter is applicable to all workmanship and materials, including work by subcontractors and suppliers. The consultants consist of Architects, Civil Engineer, Mechanical and Electrical Engineer and the Quantity Surveyor. In the traditional method, the client take on the consultants which are assigned for design, cost control, and contract administration, and that the contractor is in charge for carrying out the works.