The efforts of the Working Group on DWI System Improvements have served to identify critical system needs, to make needed educational materials available, to articulate the complex issues associated with program and policy implementation embedded within broader systems, to give voice to the concerns of practitioners in the impaired driving system and to identify achievable solutions. [...] Each of the nine sections is structured according to the types of strategies that may be considered to strengthen a particular area, important caveats that may influence the strategies, and examples of practical resources that provide more operational guidance and information. [...] The identification of trends in relation to the level and type of resources that have previously been requested and allocated to DWI initiatives is important information to consider during the development of DWI initiatives. [...] Inaccurate or insufficient data is a serious threat to the Inaccurate or insufficient data is a serious threat effectiveness of any to the effectiveness of any program and can be program and can be detrimental to data improvements. [...] The objective of this edition is to further advance the data collection standard to streamline frontline data collection and provide flexibility for data collectors and managers as vehicles and the driving environment continue to evolve.