This study informs the US Departments of Labor and Education about options to consider in adopting one or more Effectiveness in Serving Employers (ESE) measures across all Workforce Innovation and Opportunity Act core programs. Since Program Year 2016, states have reported annually on at least two of three pilot measures. The study team assessed each pilot ESE measure for validity, reliability, practicality, and unintended consequences. The study raises several options for next steps, including further research on the implementation of the ESE measures, additional examination of alternative measures and data, and the development of statistical adjustment models.