This document summarizes research on the safety benefits of third-party contractor management systems. It finds that contractors registered with BROWZ, a third-party management system, significantly outperform national safety averages. BROWZ contractors see greater reductions in total recordable rates, days away rates, and lost work rates the longer they remain registered. The document also outlines best practices in contractor management uncovered by interviews with 14 organizations, including prequalification, pre-job risk assessment, training and monitoring contractors. It concludes by noting common challenges such as lack of oversight of subcontractor safety and recommendations to address them.