Abstract
This study uses 9 years of longitudinal, student-level data from the Los Angeles Unified School District to provide updated, empirically-based estimates of the time necessary for English learners (ELs) to become reclassified as proficient in English, as well as factors associated with variation in time to reclassification. To illustrate how different aspects of proficiency develop, estimates of the time necessary for ELs to attain six separate reclassification criteria are provided. Findings corroborate prior cross-sectional research suggesting that the development of full proficiency in a second language typically takes 4 to 7 years. However, after 9 years in the district, approximately one-fourth of students had not been reclassified. There appears to be a
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