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A Systematic Quantitative Literature Review of the Contribution of Phonics to Overall Reading Performance for Primary Students: History
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Contributor: Beryl Exley , Kylie Zee Bradfield , Danielle H. Heinrichs , Sonja Clancy

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.

  • Systematic Quantitative Literature Review (SQLR)
  • reading performance
  • phonics instruction
  • foundational reading elements
  • instructional strategies
  • teacher professional learning
  • pedagogical decision-making
  • implementation fidelity
Despite widespread interest in improving reading outcomes, there remains limited consensus on which instructional content and instructional strategies effectively support students’ overall reading performance. In response to the overwhelming volume of research on the teaching of reading in the primary school years (students 4 to 12 years of age), and a tendency for traditional narrative literature reviews to selectively cite studies that support particular perspectives [1], the authors seek a more transparent approach through a Systematic Quantitative Literature Review (SQLR). Over the last four and a half decades, the volume of research on instructional content (the “what”) and instructional strategies (the “how”) for the teaching of reading has expanded exponentially, creating both opportunities and challenges for evidence-informed practice. The influential United States (U.S.) National Reading Panel Report [2] opened with the claim that “100,000 research studies on reading have been published since 1966, with perhaps another 15,000 appearing before that time” (p. 1). In January 2024, as the authors prepared this review, a Google Scholar search using the phrase “teaching of reading” yielded approximately 5.29 million results. To refine the scope and reduce the inclusion of gray literature, the authors narrowed the search to “teaching of reading scientific study”, which still returned a staggering 2.27 million results. In light of the scale and diversity of available research, and the potential for implicit bias in how studies are selected and interpreted [1], the authors employ the five-phase SQLR method devised by Pickering et al. [3]. This method enables a structured examination of peer-reviewed research studies that quantitatively report on the contribution of instructional content paired with particular instructional strategies to students’ overall reading performance.
Konza’s [4] synthesis traces the emergence of a “highly credentialed framework” comprising the five interrelated elements of phonological awareness, phonics, vocabulary, fluency, and comprehension [5][6][7]. Konza [4] and Cross [5] offer empirical justification (or what Pearson and Gallagher [1] term “existential proof”), demonstrating how each either interacts synergistically or independently to support students’ overall reading development. Multiple studies reinforce the essential role of phonological awareness (the ability to focus on and manipulate phonemes in spoken words) [8][9] in supporting students’ phonics knowledge (letter-sound knowledge), their ability to decode written words, and the impact of this on reading fluency [10]. Comprehension, both literal (understanding information that is literally on the page) and inferred (integrating textual cues with prior knowledge to understand information that is not directly stated on the page), is also reported as being an essential element of reading development [11].
Konza [4] advances a compelling case for the inclusion of oral language as a sixth element contributing to reading development (see also [12]). Konza [4] draws on notable studies from Nation and Snowling [13] and Snowling [14], which demonstrate that individual differences in oral language proficiency account for significant variations in reading comprehension. A major finding is that oral language proficiency exceeds the predictive power of age, non-verbal reasoning, or non-word decoding on overall reading development [13]. Similarly, Roth et al. [15] track 39 students from Kindergarten to Year Two to identify the predictive relationship between oral language skills assessment in kindergarten vis-à-vis reading performance in Years One and Two. Fielding-Barnsley and Hay [16] report on a study involving 47 Year One students with low levels of language development. These students participate in a structured oral language intervention comprising 16 × 30 min sessions delivered over eight weeks. The sessions, facilitated by trained research assistants working with small groups of four to five students, offer dialog-based instruction. Activities include matching experiences, describing classifications, sharing oral recounts, and reasoning about lived events, all designed to enhance expressive and receptive language skills. The differential contribution of oral language subskills to students’ reading performance across distinct phases of reading development is confirmed [16].
These six elements are embedded to varying degrees in multiple major international reports and reviews on the teaching of reading. For example, the National Reading Panel Report [2] devotes entire chapters to the contribution of alphabetics (made up of phonemic awareness and phonics instruction), comprehension, and fluency to students’ reading development. The report also recognizes the importance of “the alphabetic code that represents oral language in writing” (pp. 2–100) and the need to “guarantee that the vocabulary items are in the oral language of the reader” (pp. 4–25). The United Kingdom’s (U.K.) Independent Review of the Teaching of Early Reading: Final report [17] lists “phonological awareness and letter-sound knowledge as important prerequisites for successful reading development” (p. 38), alongside “developing spoken language, building vocabulary, grammar, (and) comprehension” (p. 16) to support students’ reading development. Fluency is acknowledged as an outcome of effective phonics instruction and language-rich teaching [17]. Recommendation Two from the Australian Government commissioned report, Teaching Reading: National inquiry into the teaching of literacy [18], advises that teachers should provide “systematic, direct and explicit phonics instruction” alongside an “integrated approach to reading that supports the development of oral language, vocabulary, grammar, reading fluency, (and) comprehension…” (p. 14). This report defines letter-sound rules as including “phonemic awareness and phonological knowledge” (p. 31). Recommendation Two from the Canadian Language and Literacy Research Network Summary Report, National Strategy for Early Literacy [19], states that instructional strategies “must include systematic, direct, and explicit instruction, supporting the acquisition of essential alphabetic, code-breaking skills, and the development of strong oral language, vocabulary, grammar, fluency, and reading comprehension skills” (p. 10).
The six elements are used here as instructionally defined categories, rather than as a developmental or cognitive model of reading acquisition, and are limited to domains that have been examined through teacher-delivered classroom interventions with measures of overall reading performance. With this understanding in place, in 2024, the authors implemented the five-phase SQLR method developed by Pickering et al. [3]. Unlike traditional narrative reviews which often omit a literature review methodology and are therefore considered highly subjective [1], the authors make explicit their replicable process for identifying relevant studies. SQLRs are noted for systematically coding content and generating visual displays and thematic subcategories [20]. The SQLR differs from meta-analyses in both scope and treatment of evidence. While both use systematic methods to identify relevant literature, meta-analyses typically include only experimental studies with statistically analyzed data and apply statistical techniques to aggregate findings [21]. In his examination of research spanning systematic phonics and alternative methods of reading instruction, Bowers [22] cautions that meta-analyses are often built on “mischaracterization” of original research that is then “passed on and exaggerated by many others” who cite only the meta-analysis (pp. 682–683). SQLRs allow for a broader range of study designs and focus on mapping and evaluating evidence from the original publication without combining results through statistical synthesis. SQLRs also illuminate shifts in research focus over time, helping to identify when aspects of reading instruction first gain prominence as areas of inquiry. By mapping studies across types of research publications, research location, research methods, year of publication, and elements of reading development, the SQLR supports an understanding of how research on the teaching of reading evolves in response to methodological trends, instructional content and strategies, and representations of the teacher as the pedagogical decision maker [23].

This entry is adapted from the peer-reviewed paper 10.3390/encyclopedia6030061

References

  1. Pearson, P.D.; Gallagher, M.C. The Instruction of Reading Comprehension. Contemp. Educ. Psychol. 1983, 8, 317–344.
  2. National Institute of Child Health and Development (NICHD). Teaching Children to Read: An Evidence-Based Assessment of the Scientific Research Literature on Reading and Its Implication for Reading Instruction; NIH Publication No. 00-4769; National Reading Panel: Washington, DC, USA, 2000. Available online: https://www.nichd.nih.gov/publications/pubs/nrp/pages/smallbook.aspx (accessed on 20 February 2026).
  3. Pickering, C.; Johnson, M.; Byrne, J. Using systematic quantitative literature reviews for urban analysis. In Methods in Urban Analysis; Baum, S., Ed.; Springer: Berlin/Heidelberg, Germany, 2021; pp. 29–50.
  4. Konza, D. Teaching Reading: Why the “Fab Five” should be the “Big Six”. Aust. J. Teach. Educ. 2014, 39, 10.
  5. Cross, C. The Relationship Between the Reading in Motion Program and Early Literacy: A Study on the Effect of the Reading in Motion Program and Reading Fluency in Kindergarten Students. Ed.D. Thesis, University of St. Francis, Joliet, IL, USA, May 2019.
  6. Paige, D.D.; Young, C.; Rasinski, T.V.; Rupley, W.H.; Nichols, W.D.; Valerio, M. Teaching reading is more than a science: It’s also an art. Read. Res. Q. 2021, 56, S339–S350.
  7. Tindall, E.; Nisbet, D. Exploring the essential components of reading. J. Adult Educ. Inf. Serv. 2010, 39, 1–9.
  8. Carson, K.L.; Gillon, G.T.; Boustead, T.M. Classroom phonological awareness instruction and literacy outcomes in the first year of school. Lang. Speech Hear. Serv. Sch. 2013, 44, 147–160.
  9. Khan, M.; Khan, R. Phonological awareness and phonics instruction: Inclusive practice that benefits all kinds of learners. Asia Pac. J. Dev. Differ. 2021, 8, 173–185.
  10. Eldredge, J.L. Foundations of Fluency: An Exploration. Read. Psychol. 2005, 26, 161–181.
  11. Kendeou, P.; McMaster, K.L.; Christ, T.J. Reading Comprehension: Core Components and Processes. Policy Insights Behav. Brain Sci. 2016, 3, 62–69.
  12. Castles, A.; Rastle, K.; Nation, K. Ending the reading wars: Reading acquisition from novice to expert. Psychol. Sci. Public Interest 2018, 19, 5–51.
  13. Nation, K.; Snowling, M.J. Beyond phonological skills: Broader language skills contribute to the development of reading. J. Res. Read. 2004, 27, 342–356.
  14. Snowling, M. Literacy outcomes for children with oral language impairments: Developmental interactions between language skills and learning to read. In The Connection Between Language and Reading Disabilities; Catts, H.W., Kamhi, A.G., Eds.; Psychology Press: Hove, UK, 2005; pp. 55–75.
  15. Roth, F.P.; Speece, D.L.; Cooper, D.H. A longitudinal analysis of the connection between oral language and early reading. J. Educ. Res. 2002, 95, 259–272.
  16. Fielding-Barnsley, R.; Hay, I. Comparative effectiveness of phonological awareness and oral language intervention for children with low emergent literacy skills. Aust. J. Lang. Lit. 2012, 35, 271–286.
  17. Rose, J. Independent Review of the Teaching of Early Reading: Final Report; Department for Education & Skills: London, UK, 2006; Available online: http://dera.ioe.ac.uk/id/eprint/5551/2/report.pdf (accessed on 20 February 2026).
  18. Rowe, K.; National Inquiry into the Teaching of Literacy. Teaching Reading: Report and Recommendations; Department of Education, Science and Training: Canberra, Australia, 2005; Available online: https://research.acer.edu.au/tll_misc/5/ (accessed on 20 February 2026).
  19. Jamieson, D.G. National Strategy for Early Literacy: Summary Report 2009; Canadian Language and Literacy Research Network: London, ON, Canada, 2009; Available online: https://www.strongstart.ca/wp-content/uploads/National-Strategy-for-Early-Literacy.pdf (accessed on 20 February 2026).
  20. Li, Y.; Zhang, S. Applied Research Methods in Urban and Regional Planning; Springer: Cham, Switzerland, 2022.
  21. Silverman, R.D.; Johnson, E.; Keane, K.; Khanna, S. Beyond decoding: A meta-analysis of the effects of language comprehension interventions on K-5 students’ language and literacy outcomes. Read. Res. Q. 2020, 55, S207–S233.
  22. Bowers, J.S. Reconsidering the evidence that systematic phonics is more effective than alternative methods of reading instruction. Educ. Psychol. Rev. 2020, 32, 681–705.
  23. Exley, B.; Hoyte, F.; Singh, P. When the curriculum demands personalization: Adaptive professionalism, pre-packaged plans & the teaching of phonics & spelling. Aust. J. Lang. Lit. 2025, 48, 161–174.
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