Construction management at risk (CMAR) is a project delivery method commonly used in the construction industry. It involves a contractual agreement between the owner, the construction manager, and the contractor, in which the construction manager assumes the risk associated with the project. In this process, the construction manager becomes involved early on in the project's initial phase to provide input and expertise. This enables them to have a good understanding of the project's requirements and constraints, allowing them to better manage construction risks.

One of the key advantages of the CMAR approach is that it allows for greater collaboration between the owner, construction manager, and contractor, thus improving communication and ultimately leading to a more successful project outcome. The CMAR approach also improves cost control and reduces the potential for change orders and project delays. Additionally, the CMAR approach allows the owner to have greater control over the project as progress is monitored closely, allowing necessary adjustments to be made along the way.