For several years, WestEd's Measure to Learn and Improve (MLI) project team has kept California state policy leaders informed about the statewide implementation of the California Academic Standards in English language arts and mathematics, by summarizing and disseminating results from the RAND Corporation's annual American Educator Panel (AEP) surveys of teachers and principals. This brief contrasts the perceptions of California educators who serve a relatively high proportion of English learner (EL) students (i.e., over 25 percent of students) with the perceptions of educators who are serving a relatively high proportion of EL students in three comparison states.