SRI study finds structured linguistic phonics boosts reading for older learners

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A new study from SRI, conducted for AERDF’s Reading Reimagined program, offers rigorous evidence on phonics instruction for grades 4–8.

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SRI evaluated Sounds-Write, a structured linguistic phonics (SLP) program that takes a “speech-to-print” approach. Rather than teaching syllable-type rules, silent-letter conventions, or sight words, SLP builds students’ understanding around four core concepts of the English alphabetic code, an approach designed to help students develop “set for variability,” the flexible decoding skill needed for complex, multisyllabic text.
The study is groundbreaking in two ways: phonics interventions are rarely studied in middle school, and SLP approaches to phonics have rarely been evaluated rigorously. The study combined randomized and quasi-experimental designs across two districts, three teacher cohorts, nine schools, 30 teachers, and 448 students, comparing SLP to schools’ typical literacy instruction.

Key findings:

• Students taught with SLP gained 6.4 percentile points on word reading and 5.6 points on sentence reading efficiency relative to peers; these are meaningful gains for this age range by established benchmarks.
• Gains held broadly across subgroups (SES, English learner status, and IEP status) rather than concentrating among advantaged students.
• Spelling outcomes showed no advantage over typical instruction, a notable result the researchers attribute to inconsistent implementation or benefits students received. Spelling outcomes are rarely measured in this age range.
• Teachers implemented the program’s rule-free features with strong fidelity but were less consistent on the a few of the more demanding components.
• Most teachers preferred SLP to prior phonics approaches (69% rated it more effective; 63% planned to continue using it); middle school teachers wanted faster pacing for older students with prior phonics exposure.

SRI frames this as an early but rigorous data point to ask the question: does phonics instruction have a role when students are past the early-literacy years? And if so, what kind of role?