This single source delivery method is advantageous when the schedule is vital. In a Contractor led Design-Build scenario, the Owner hires a contractor and the contractor is responsible for assembling a designer who works for the Contractor. This approach offers a single source with whom to communicate. The Contractor and Architect work closely during design to ensure that the design is on budget. Construction may even begin before design is completed through a fast-track method. The price is usually fixed early with contingencies for both design and construction. Under this delivery method, Principle Construction acts as the single point of contact.