The design / build concept is a type of the construction process that in many ways is still emerging. Typically, design / build describes a single source of contracting responsibility where the contractor is responsible for both the design and construction. This delivery method streamlines communication with the owner and simplifies the entire contracting process. Speed and cost reductions are often cited as key advantages to design / build. Under contractor-led design / build, the contractor assumes full responsibility to the owner for all phases of the project.