To better understand the validity of TRIR as a performance metric, this study attempted to answer the basic question: Given the way that it’s used, to what extent is TRIR statistically valid? More specifically, this research aimed to test whether TRIR is statistically stable, precise, predictive, and indicative of high-severity events. The answer will help clarify if TRIR should be used to make important business decisions like comparing two contractors, evaluating the safety performance of managers, or concluding that a new safety intervention is effective. This research was made possible by the funding provided by the members of the Construction Safety Research Alliance (CSRA). The CSRA is a non-profit organization that supports collaboration between industry and academia on safety research and development.