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Visible Learning™
Visible Learning MetaX™
Version 1.4 – Updated February 2026

Phonics instruction

Overview

  • Influence: Phonics instruction
  • Domain: Curricula
  • Sub-Domain: Reading, writing and the arts
  • Potential to Accelerate Student Achievement: Potential to considerably accelerate
  • Influence Definition: A form of instruction that stresses the acquisition of letter-sound correspondences in reading and spelling. It involves teaching children the sounds made by individual letters or letter groups (for example, the letter "c" makes a k sound), and teaching children how to merge separate sounds together to make it one word (for example, blending the sounds k, a, t makes CAT).

Evidence

  • Number of meta-analyses: 10
  • Number of studies: 424
  • Number of students: 73,243
  • Number of effects: 662
  • Weighted mean effect size: 0.97
  • Robustness index: 4

Meta-Analyses

Meta-Analyses
Journal Title Author Article Name Year Published Variable Number of Studies Number of Students Number of Effects Effect Size
Dissertation Gassler A meta-analysis of classroom studies that have compared code-emphasis to non-code-emphasis first grade reading methods. 1992 Word vs. non-word interventions 52 NA 63 0.35
Review of Educational Research Ehri, Nunes, Stahl, & Willows Systematic phonics instruction helps students learn to read: Evidence from the National Reading Panel's meta-analysis. 2001 Systematic phonics instruction 34 NA 66 0.41
Education Policy Analysis Archives Camilli, Vargas, & Yurecko "Teaching children to read': The fragile link between science and federal education policy 2003 Phonics instruction 40 NA 40 0.24
Report Torgerson, Brooks, Hall & Britain A systematic review of the research literature on the use of phonics in the teaching of reading and spelling 2006 Phonics instruction 19 NA 20 0.27
Education and Urban Society Jeynes A meta-analysis of the relationship between phonics instruction and minority elementary school student academic achievement 2007 Phonics for minority students 22 5,000 22 0.30
British Journal of Educational Psychology Adesope, Lavin, Thompson, & Ungerleider Pedagogical strategies for teaching literacy to ESL immigrant students: A meta-analysis. 2011 Systematic phonics instruction with ESL students 14 1,647 14 0.40
Reading Research Quarterly Piasta & Wagner Developing early literacy skills: a meta-analysis of alphabet Learning and Instruction 2010 Alphabet learning on outcomes 63 8,468 82 0.43
Review of Educational Research Weiser & Mathes Using encoding instruction to improve the reading and spelling performances of elementary students at risk for literacy difficulties: A best-evidence synthesis 2011 Encoding instruction 11 NA 11 0.78
Review of Educational Research Tong, Yu, &Deacon A Meta-Analysis of the Relation Between Syntactic Skills and Reading Comprehension: A Cross-Linguistic and Developmental Investigation.  2024 Syntactic skills 59 15,212 234 1.28
Review of Educational Research Garcia & Cain Decoding and reading comprehension: A meta-analysis to identify which reader and assessment characteristics influence the strength of the relationship in English.  2024 Decoding 110 42,916 110 2.20
TOTAL/AVERAGE 424 73,243 662 0.67
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