A Systematic Quantitative Literature Review of the Contribution of Phonics to Overall Reading Performance for Primary Students

This Systematic Quantitative Literature Review (SQLR) examines instructional content (the what) and instructional strategies (the how) that contribute to overall reading performance for students in mainstream English-speaking primary classes. Drawing on 163 peer-reviewed studies published over four and a half decades, the authors examine instructional content and strategies aligned with six interrelated foundational elements of reading development: phonological awareness, phonics, vocabulary, fluency, comprehension, and oral language. In response to the proliferation of reading research and the limitations of narrative reviews, the five iterative phases of the SQLR method enable rigorous selection, coding, and synthesis of studies reporting quantitative evidence of the contribution of instructional content and strategies to students’ overall reading performance. The second part of the paper focuses on phonics instruction, an element of the teaching of reading central to ongoing public, educational, and political debate. The authors identify significant variation in terms of the scale, duration, and year-levels of the reported research, and foreground the complex roles of teacher professional learning, teachers’ pedagogical decision-making, and implementation fidelity in shaping the research projects. The paper finishes by synthesizing evidence that concludes that while phonics instruction can contribute to overall reading performance, its effects are variable and contingent on specific instructional and contextual conditions.