Since the earliest studies on multilingual advantages, it has proved difficult to disentangle language development from general cognition. It remains unclear whether language interdependence is an independent variable or whether observable effects are mediated by cognitive ability. Measurable effects of one language on another typically go hand in…

The School District of Philadelphia (SDP) serves a diverse population of English Learners (ELs) with different ethnic backgrounds, cultural identities, and languages spoken. SDP's population of ELs has grown significantly, from about 12,000 in 2014-15 to nearly 20,000 in 2022-23, an increase of 66%. This community-informed study focuses on English…