Which of the following is NOT an essential concept of Design-Build?

The selection of "Multiple Design Phases" as the option that is not an essential concept of Design-Build is supported by an understanding of how the Design-Build delivery method operates. In Design-Build, the key characteristic is that a single entity works on both design and construction, which promotes efficiency and collaboration. This often results in a streamlined process that favors the completion of design and construction in fewer phases or as a more integrated approach.

Design-Build projects typically focus on a unified project delivery mechanism where the design and construction phases overlap. This integration can minimize conflict and reduce delays since the same organization manages both aspects. Unlike traditional delivery methods, which may involve multiple, distinct design phases, Design-Build emphasizes a cohesive approach to project delivery.

In contrast, the other concepts mentioned—Single Point of Responsibility, Contract Controls, and Design-Cost Relationship—are all fundamental to the Design-Build approach. Single Point of Responsibility ensures that the owner has a single contact for both design and construction, which simplifies communication. Contract Controls help manage the risks and obligations of both parties effectively, while the Design-Cost Relationship focuses on aligning design decisions with budget constraints to ensure the project's financial viability. Thus, Multiple Design Phases does not align with the core