Guide
What is the science of reading?
6 min read
The science of reading is a body of research from cognitive science, linguistics, and neuroscience describing how people learn to read. Here's what it actually says, where it disagrees with 'balanced literacy,' and why so many states are rewriting their ELA curricula around it.
The science of reading is not a curriculum. It is the accumulated research from cognitive science, linguistics, developmental psychology, and neuroscience describing how the human brain learns to read. Curricula are designed from this research base. The phrase “science of reading” has become shorthand both for the research itself and for the policy reform pushing schools to align instruction with it.
The Simple View of Reading
The most-cited single summary, proposed by Gough & Tunmer in 1986, is the Simple View:
Reading comprehension = decoding × language comprehension
The multiplication matters. A reader who can decode but lacks vocabulary will not comprehend; a reader with strong vocabulary who can’t decode also won’t comprehend. Both skills are necessary; neither is sufficient. Decades of research have refined what goes into each side of the equation, but the multiplicative structure has held up.
Scarborough’s Reading Rope
Hollis Scarborough’s 2001 model extended the Simple View into a visual of two strands weaving together over years:
- Word recognition — phonological awareness, decoding (alphabet-sound mappings), and sight recognition of high-frequency words
- Language comprehension — background knowledge, vocabulary, language structures (syntax, semantics), verbal reasoning, and literacy knowledge (print conventions, genre)
Skilled reading is when these strands have woven so tightly together that they become automatic. Early instruction has to build both strands; weakness in either limits the rope’s strength.
Where the science conflicts with balanced literacy
Balanced literacy, the dominant US elementary reading approach from roughly 1995-2020, emphasized:
- Leveled readers selected at the child’s “just right” level
- Mini-lessons + guided reading in small groups
- Three-cueing strategies for unfamiliar words: meaning (context), structure (syntax), visual (letters)
- Authentic literature over decodable texts
The science of reading conflicts most sharply on three-cueing. The research finds that encouraging readers to guess unfamiliar words from pictures or context — without first decoding — interferes with the brain forming reliable letter-sound mappings, which are the foundation of fluent reading. Several states (Tennessee, Mississippi, California, Texas) have legislatively banned three-cueing in their state-adopted curricula.
What aligned instruction looks like
Science-of-reading aligned K-2 instruction generally includes:
- Explicit, systematic phonics instruction following a defined scope and sequence
- Decodable texts (every word decodable using phonics taught so far) during early reading practice
- Daily phonological awareness routines in K-1
- Direct vocabulary instruction tied to content-area knowledge (science, social studies, art)
- Read-alouds of grade-level complex texts to build background knowledge above the child’s independent reading level
- Universal screening (early literacy benchmarks) for dyslexia and decoding gaps
State policy landscape
As of 2024, at least 38 US states have passed laws or formal policies requiring science-of-reading aligned instruction. The earliest were Mississippi (2013, “Mississippi Miracle” that lifted state reading scores) and Tennessee (2014). The wave accelerated 2019-2023 after Emily Hanford’s APM podcast series “Sold a Story” brought the debate to mainstream attention. Several large districts (NYC, LA Unified, Chicago) have announced curriculum shifts in 2022-2024.
Common misconceptions
The science of reading isn’t just phonics. Strong phonics instruction is necessary but not sufficient. The research equally emphasizes vocabulary, background knowledge, and fluency. A program that “does phonics” but ignores knowledge-building is not science-of-reading aligned.
The science of reading isn’t finished. Research continues. Areas under active study include: instruction for English learners, supports for dyslexic readers, balance of decodable vs trade text in grade 2-3, and how comprehension develops beyond elementary school. The broad framework (Simple View, Reading Rope, systematic phonics) has strong evidence; specific implementations continue to evolve.
This is a parent-relevant shift.If your child started K-2 before 2020, they were probably taught with balanced literacy methods. If they’re in K-2 now, the curriculum has likely changed or is changing. Knowing the framework helps you understand what your child’s report card is now measuring (phonemic awareness benchmarks, decoding fluency, oral reading rate) and why.
For state-by-state reading instruction policy, see your state page. For reading-level frameworks (Lexile, DRA, Guided Reading), see our comparison guide.
Common questions
- What is the science of reading in one sentence?
- It is the multidisciplinary research base — from cognitive science, linguistics, developmental psychology, and neuroscience — describing how the human brain learns to read. It is not a curriculum; curricula are designed from it.
- What is the Simple View of Reading?
- Reading comprehension = decoding × language comprehension (Gough & Tunmer, 1986). A reader needs BOTH skills, and weakness in either zeros the product. The Simple View is the most-cited single summary of the science of reading and underlies most state-level reform.
- How does the science of reading differ from balanced literacy?
- Balanced literacy emphasizes guided reading, leveled texts, and word-cueing strategies (look at the picture, guess from context). The science of reading emphasizes systematic phonics, decodable texts, and direct vocabulary and background knowledge instruction. Where they conflict most: how struggling readers should be taught to identify unfamiliar words.
- What is Scarborough's Reading Rope?
- A visual model (Hollis Scarborough, 2001) showing skilled reading as the weaving together of two strands: word recognition (phonological awareness, decoding, sight recognition) and language comprehension (background knowledge, vocabulary, language structures, verbal reasoning, literacy knowledge). Both strands strengthen and weave more tightly over years.
- Which states are mandating science-of-reading instruction?
- As of 2024, at least 38 US states have passed laws or policy mandates requiring science-of-reading aligned instruction or banning specific balanced-literacy practices (often called 'three-cueing'). The earliest were Mississippi (2013) and Tennessee (2014); the wave accelerated 2019-2023.