The objective of this Best Practice is to assist Owners, Prime Contractors and Contractors to develop effective Contractor EHS-environment, health and safety management systems and/or processes. Effective EHS management systems will promote a collaborative working relationship between Owners, Prime Contractors and Contractors, resulting in improved HS&E and productivity for all parties involved. This best practice covers four key areas: Contractor Pre-qualification, Contractor Selection, Mobilization and Contractor Performance Evaluation. All supporting documents have been combined here with the main best practice report for easier printing, each individual item can still be found in the library. This document was prepared in 2007 at the request of the COAA Safety Committee.