Currently, performance measurement in the California Work Opportunity and Responsibility to Kids (CalWORKs) program is relatively limited and largely focuses on processes involved with the program's operation—particular emphasis is given to a federal performance measure known as the "work participation rate" (WPR)—rather than on the program's end results, or outcomes. As part of the 2017-18 budget package, the Legislature adopted a new framework for performance measurement in CalWORKs that will be known as the CalWORKs Outcomes and Accountability Review (Cal-OAR). In this report, we outline the rationales for measuring program performance and outline why, ideally, performance measurement should focus on outcomes. We then raise several issues to be considered as the Cal-OAR system is further developed and implemented in the coming years.