Theoretical Models Supporting Content-Based Instruction in ESL

Abstract

This study presents a systematic review of the theoretical models supporting content-based instruction in teaching English as a Second Language from 2014 to 2025. Content-based instruction is an instructional approach that integrates language learning with meaningful academic content, allowing students to acquire English while studying subjects such as science, history, and literature. The purpose of this review was to identify the main theoretical frameworks that explain how and why content-based instruction effectively promotes both language and content learning. Twenty studies, twelve from Google Scholar and eight from ERIC, were analyzed using the PRISMA framework. The findings revealed that content-based instruction is grounded in several interconnected theories, including cognitive learning theory, constructivism, communicative language teaching, sociocultural theory, and content and language integrated learning. These models collectively emphasize that learners acquire English more effectively when they actively use the language to process, apply, and communicate real-world content. Studies consistently showed that authentic materials, meaningful communication, and scaffolding strategies enhance learners’ engagement and comprehension. Moreover, recent research highlights the growing role of digital and technology-enhanced content-based instruction models, which promote collaboration, critical thinking, and digital literacy in modern English classrooms.