Design-build construction methods, where the designer and constructor are the same entity or are on the same team rather than being hired separately by the owner, began to make a resurgence in America at the end of the twentieth century. Most of these design-build projects were and are led by the contractor, who hires an architect to design its building, which the contractor then builds for its client, the owner.More recently, some architects have begun to embrace a lead role in the design-build approach. They contract with the owner both to design and to construct a building, and they procure the construction services either by subcontracting to a general contractor or by contracting directly with the various construction trades. Ironically, although the notion of an architect leading a design-build team is considered new and innovative, it is really a return to the construction approach employed for the millennia prior to the twentieth century, in which the architect was the Masterbuilder, rather than merely the designer.The following definition describes, assesses and compares the architect-led design–build (ALDB) process to other, related architectural project delivery methods. It focuses on the architect’s role in each method, and characterizes that role in terms of responsibility. Responsibility is interpreted in terms of how much direct contact with the client (building owner) and how much control over the project the architect has, and how much risk the architect bears. The architect's role and responsibilities may change in function of the geopolitical location of the development and other criteria.This definition of ALDB outlines the broader context of design–build, presenting that as an alternative to the traditional design–bid–build process for making buildings. First, this traditional process is introduced, then the distinct forms of design–build are explained, and from there, the focus narrows to examine specific forms of the architect-led design build method, what distinguishes it, the benefits and limitations, the results that it can achieve.