The RP Group's Multiple Measures Assessment Project (MMAP) produced this technical report as part of a series on how California's community colleges can ensure more English learners (ELs) successfully complete "gateway" English coursework -- courses that satisfy the English writing requirements for completion of an associate's degree as well as for transfer to a four-year college or university -- in a timely way. The report summarizes findings on how well information about international students' initial curricular pathway (English or ESL), level of placement in the pathway, and ESL placement test score(s) can predict their throughput in gateway English. It specifically focuses on the value of different commonly used ESL placement tests to this process, including the Combined English Language Skills Assessment (CESLA) and multiple types of ACCUPLACER tests. It begins with key findings from this research followed by a description of the research methodology. Then, it offers a detailed analysis of the predictive validity of different ESL placement tests for students' throughput. It concludes with high-level recommendations based on these findings. The report is intended to support the California Community Colleges Chancellor's Office (CCCCO) and other educators and policymakers involved in development education reform in their decision-making about ways to continue supporting the success and completion of English learners in the system.