Unraveling the Efficacy of Differentiated Instruction in Enhancing Second Language Acquisition: A Comprehensive Review and Future Directions

Abstract

"The art of being taught is the art of discovery, as the art of teaching is the art of assisting discovery." as famously quoted by Mark Van Doren in his 1943 book Liberal Education, reflects the philosophy of Differentiated Instruction (DI), an approach designed to respond to students’ diverse learning needs, interests, abilities, and levels of readiness. As classrooms become increasingly diverse and multilingual, the need for effective approaches to second language (L2) instruction has become more important. This comprehensive review examines the role of DI in second language acquisition (SLA) and explores how differentiation can be integrated into L2 instruction through adjustments in content, process, product, and the learning environment. The review also examines empirical evidence on the benefits, challenges, and practical use of DI in language classrooms. Findings from the reviewed literature suggest that DI has the potential to improve L2 achievement and reading comprehension while also supporting learner motivation, engagement, self-efficacy, autonomy, and inclusive participation. At the same time, the literature identifies challenges related to planning and time demands, learner preparation, and the need for appropriate instructional support. These findings suggest that successful implementation of DI requires careful planning, continuous assessment, flexible teaching practices, and professional development for language teachers. The review further recommends more empirical and longitudinal research across different L2 contexts, learner populations, and language skills to better understand the long-term effects of DI on second language development. Overall, DI appears to be a promising approach for addressing learner diversity and supporting more responsive and inclusive L2 instruction.