This document discusses the application of Response to Intervention (RTI) to support English Language Learners (ELLs) in Massachusetts, including a study's findings on varied implementation of RTI/MTSS models. It highlights recommendations for improving support for struggling ELLs through collaborative planning across special education and ESL providers and case studies from Boston Public Schools. The document emphasizes the importance of data-driven decision making and evidence-based instructional strategies for enhancing literacy outcomes among ELLs.