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Any project delivery method that contractually engages the contractor responsible for constructing the project at the beginning of the design process. Both design-build and at-risk CM are considered integrated project delivery models. However, there is a more formalized method of IPD that utilizes a multiparty agreement and represents a unique project delivery approach.

Integrated Project Delivery (IPD) is a project delivery approach that integrates people, systems, business structures, and practices into a process that collaboratively harnesses the talents and insights of all participants to optimize project results, increase value to the owner, reduce waste, and maximize efficiency through all phases of design, fabrication, and construction.

IPD principles can be applied to a variety of contractual arrangements, and IPD teams can include members well beyond the basic triad of owner, architect, and contractor. In all cases, integrated projects are uniquely distinguished by highly effective collaboration among the owner, the prime designer, and the prime constructor, commencing at early design and continuing through to project handover.

Generally speaking, integrated project delivery is any form of project delivery that brings the contractor on board as part of the team at the onset of the design process. In other words, instead of waiting until the design is complete, the contractor who is going to build the project is on board while the design is being developed. In this arena, the construction manager will have an opportunity to contribute their expertise relative to constructability, building costs, labor availability, scheduling issues, and the like. Because the design has such an impact on all of these construction issues, having the contractor's input up front helps the architect make better design decisions and avoid project delays, cost overruns, or unconstructible building details.

Under this definition, both design-build and at-risk CM can be classified as integrated project delivery models. However, there is also an IPD approach that has a unique contracting format known as an Integrated Form of Agreement or IFOA. An IFOA is a multiparty agreement, whereby the owner, architect, and contractor (O/A/C) all sign one agreement and share liability for the development and delivery of both the design and construction of the project. In this sense, the owner is actually accountable for the delivery of their own project, and may benefit from financial gains, or suffer financial losses, associated with the project's performance. According to Hanson Bridgett's Executive Summary of IFOA, the purpose of the IFOA is:

“To provide a legal relationship among the owner, design team, and construction team that aligns them on what is best for the project as a whole.”