In which project delivery system do the designer, contractor, and owner share a multi-party contract?

The project delivery system where the designer, contractor, and owner share a multi-party contract is Integrated Project Delivery (IPD). This approach emphasizes collaboration among all key stakeholders right from the project's inception. In IPD, the three parties enter into a single, shared contract that aligns their interests, goals, and deliverables, promoting open communication and reducing adversarial relationships that can occur in more traditional delivery methods.

This collaborative contract structure facilitates joint decision-making, shared risk and reward, and encourages collective responsibility for the project's success. It contrasts with other systems where the relationships may not be as interconnected, such as Design-Bid-Build, where the designer and contractor operate under separate agreements, leading to potential misalignments in project goals. In Construction Manager at Risk, while there can be collaborative elements, the separate contracts still create a more fragmented approach than what is found in IPD. Design-Build also involves a more integrated relationship between the designer and contractor but typically involves a contract only between these two parties and the owner, without the same level of shared commitment as seen in IPD.