This document discusses best practices for engaging mechanical, electrical, and plumbing (MEP) subcontractors early in integrated project delivery. It recommends a three-step process: 1) Subcontractor "auditions" where subcontractors present their qualifications without a contractual agreement; 2) A planning stage agreement (part 1 of 2) if the audition is satisfactory, defining work to be performed; 3) A construction subcontract (part 2 of 2) executed after design development when subcontractors have invested resources with an expectation to perform the work. The document emphasizes establishing clear expectations and commitments at each stage to ensure fair and ethical treatment of subcontractors while allowing the contractor to receive needed expertise and input to benefit the project