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It is a method to deliver a project in which the design and construction services are contracted by a single entity known as the design–builder or design–build contractor. It can be subdivided into architect-led design–build ( ALDB , sometimes known as designer-led design–build ) and contractor-led design–build .
Design–bid–build (or design/bid/build, and abbreviated D–B–B or D/B/B accordingly), also known as Design–tender (or "design/tender"), traditional method, or hardbid, is a project delivery method in which the agency or owner contracts with separate entities for the design and construction of a project.
Design–build–finance–operate-maintain (DBFOM) [10] [11] also referred to as Design–build–finance–maintain-operate (DBFMO) [12] [13] is a project delivery method very similar to BOOT except that there is no actual ownership transfer. Moreover, the contractor assumes the risk of financing until the end of the contract period.
If speed is important, design and construction contracts can be awarded separately; bidding takes place on preliminary plans in a not-to-exceed contract instead of a single firm design-build contract. The major problem [11] with design-build contracts is an inherent conflict of interest. In a standard contract the architect works for the owner ...
Qualifications-Based Selection (QBS) is a procurement process established by the United States Congress as a part of the Brooks Act [1] and further developed as a process for public agencies to use for the selection of architectural and engineering services for public construction projects. It is a competitive contract procurement process ...
With the traditional design–bid–build process, a complete set of construction documents and specifications describes what the builder agrees to build and serves as the heart of the contract. On Fast-track projects, the design, construction documents and specifications are incomplete, so setting the final cost presents problems.
Early contractor involvement (ECI) is a type of construction contract where the principal contractor is engaged at an early stage in a project to offer input into the design phase. It is in contrast to the design–bid–build model where the contractor is only brought onboard at the end of the design phase.
Advantages of this method include clearly defined and face valid questions for each measure. Measures are also more likely to apply across populations. Additionally, it requires less statistical methodology for initial development, and will often outperform other methods while requiring fewer items. [5]