Unlike DBB, where project design and construction functions are procured sequentially, DB (sometimes called Design-Construct) combines the design and construction phases into one, fixed-fee contract. Under a DB contract, the design-builder, not the project sponsor, assumes the risk that the drawings and specifications are free from error. While the design and construction phases are performed under one contract, the design-builder may be one company or a team of companies working together. The potential benefits of DB delivery compared to traditional DBB delivery include time savings, cost savings, risk sharing, and quality improvement.