In the construct-only model, the project is fully documented by an external design team engaged by the client/principal. In the design & construct model (also known as "turnkey" or in some sectors as EPCM - engineering, procurement, construction, management), the principal engages us in early stages in order to deliver planning services, conceptual drawings, design and documentation, secure all required approvals, plan construction, procure resources and manage the entire process leading to final delivery.