In this study, the evaluation team reviewed relevant literature, interviewed key participants (management and labor) from transportation carriers that had undertaken safety rules revision, and analyzed relevant incident and injury data. Although outcome data were statistically inconclusive, a number of other indicators in this study suggested a positive benefit on carriers that used the process. Interviewees reported more enforceable safety rules, increased compliance, and overall improvements in several aspects of safety culture, such as labor-management relations. Moreover, some carriers reported significant reductions in the number of claims related to the Federal Employer's Liability Act and the cost per claim. This report examines other potential benefits, challenges, and successful implementation strategies, as well as future directions and activities.