Why Children Can Decode Words But Not Understand What They Read – and What Teachers Can Do

Why Children Can Decode Words But Not Understand What They Read, and What Teachers Can Do

Dr Lakshmi Nair, Reading specialist and primary teacher educator, Thrissur

Decoding and comprehension are different skills, and this is not just a classroom observation. It is a well-established finding in reading science with a specific theoretical framework behind it: the Simple View of Reading holds that reading comprehension is the product of decoding ability and language comprehension together, not either one alone. A child can decode fluently, sounding out every word accurately, and still fail to understand a passage if their underlying language comprehension is the limiting factor. Many Indian children who pass decoding assessments and fail comprehension tests are showing exactly this pattern, not a mysterious or unusual failure.

Key facts

• The Simple View of Reading (Gough & Tunmer, 1986) frames reading comprehension as the product of two separable components: decoding (accurately converting print to sound) and language comprehension (understanding the meaning of spoken language). A child can be strong in one and weak in the other, and comprehension only follows when both are in place.
• A large meta-analysis by the U.S. National Early Literacy Panel, synthesising roughly 300 studies, found that oral language, measured through complex, composite tools covering grammar, word definitions, and listening comprehension, correlated more strongly with later reading comprehension (r ≈ 0.70) than early decoding skill did (r ≈ 0.58). Decoding matters, but language comprehension is the stronger long-run predictor of whether a child actually understands what they read.
• A more recent meta-analysis (Jago, Monaghan, Alcock & Cain, 2025), covering 72 longitudinal studies and 23,387 children, confirmed that preschool vocabulary and grammar independently predict later reading comprehension, word reading, and pseudoword reading, reinforcing that these are genuinely separable skills rather than one skill masquerading as two.
• This distinction matters directly for assessment design: a test that only measures whether a child can read words aloud accurately, the decoding half of the Simple View, will systematically miss children whose actual barrier is language comprehension, and will make it look like those children have “passed” reading when a core part of reading is still missing.

The gap is not a mystery. It is exactly what the theory predicts

A decoding test asks “can this child turn print into sound accurately?” A comprehension test asks an entirely different question: “does this child understand what the sounds mean?” Passing the first and failing the second is not evidence of an unusual or confusing problem. It is the expected result when decoding and language comprehension develop unevenly, which the Simple View of Reading has predicted since 1986.

This distinction changes how a teacher should read an assessment result. A child who decodes accurately but cannot answer questions about what they read does not need more decoding practice, reading the same words louder and more accurately will not touch the actual gap. They need direct attention to language comprehension: vocabulary, sentence-level understanding, and the ability to build meaning from connected text, which is a different instructional target entirely.

Five principles for closing the gap specifically

1. Diagnose which half of the Simple View is actually weak for a specific child, decoding, language comprehension, or both, before choosing an intervention. Treating every reading struggle as a decoding problem, the more familiar and more commonly assessed skill, risks missing children whose real barrier is comprehension.
2. Use assessment tools that actually separate the two skills. A test that only has a child read words or a passage aloud accurately is measuring decoding, not comprehension; genuinely checking comprehension requires asking the child to demonstrate understanding of what they read or heard, not just how accurately they said it.
3. Build sustained, direct language comprehension instruction, not just more decoding practice, for children whose gap is on that side. Since language comprehension is the stronger long-run predictor of reading comprehension, per the National Early Literacy Panel’s synthesis, time spent building vocabulary, sentence understanding, and connected-text meaning-making is not a detour from reading instruction; it is a core part of it.
4. Treat vocabulary and grammar as separately worth building, not as a single undifferentiated “language skills” bucket. The more recent meta-analytic evidence found vocabulary and grammar each independently predicted later reading outcomes, meaning both deserve direct, specific attention rather than assuming general exposure to language will cover both equally.
5. Start by checking whether your own classroom’s reading assessments can actually detect this gap. If your current assessment only has children read aloud, it cannot distinguish a child who decodes well but doesn’t comprehend from a child who is genuinely reading successfully; adding a genuine comprehension check is a concrete, checkable first step.

Frequently asked questions

Is it actually common for children to pass decoding tests but fail comprehension, or is this an unusual pattern? It’s an expected pattern given the underlying theory, not an unusual one: the Simple View of Reading treats decoding and language comprehension as separable skills that can develop unevenly, and large-scale research confirms language comprehension, not decoding, is the stronger predictor of whether a child actually understands what they read.

If a child decodes well but doesn’t comprehend, does more reading practice help? Not on its own, if the practice only exercises decoding, reading words or passages aloud accurately, since that is not the skill that’s actually weak. The evidence points toward direct language comprehension instruction, vocabulary, sentence-level understanding, meaning-building from connected text, as the more relevant response for this specific gap.

How can a teacher tell whether a specific test is measuring decoding or comprehension? Check what the child is actually asked to do: reading words or a passage aloud accurately, even fluently, measures decoding. Being asked to explain, summarise, or answer questions about what was read measures comprehension. A test that only does the first cannot detect the gap this piece describes.

Are vocabulary and grammar really separate things to teach, or does one cover the other? The evidence treats them as separately predictive: recent large-scale longitudinal research found preschool vocabulary and grammar each independently predicted later reading outcomes, meaning a comprehension-building approach that only targets one is likely missing real ground the other would cover.

What to do:

1. Name one child in your class who is most affected by this gap, decoding well but struggling to demonstrate understanding, and write down one specific thing you will try differently for them this week, not a general improvement, but a named action for a named child.
2. Search DIKSHA or ask your Block Resource Coordinator for any resource specifically on comprehension-focused reading instruction, as distinct from decoding-focused instruction, in your state context. If nothing exists, note that gap; the absence of a resource is itself useful information.
3. Spend five minutes this week checking whether a specific child’s current reading assessment could actually detect a decoding-comprehension gap, or only measures reading aloud, not teaching, just watching and noting.
4. Tell one colleague about the Simple View of Reading and the specific finding that language comprehension predicts later reading outcomes more strongly than decoding does, and discuss what that means for how your school currently assesses reading.
5. At the end of the week, ask yourself what you would try differently next week, and what you would look for, such as whether a child can now explain what they read, not just read it aloud, to know whether it is working.

Sources: Gough, P. B., & Tunmer, W. E. (1986), “Decoding, reading, and reading disability,” the Simple View of Reading; Lonigan, C. J., Schatschneider, C., Westberg, L., & the National Early Literacy Panel (2008), “Developing Early Literacy: Report of the National Early Literacy Panel”; Jago, L. S., Monaghan, P., Alcock, K., & Cain, K. (2025), meta-analysis on preschool vocabulary, grammar, and early reading outcomes.

Support resources: NIPUN Bharat FLN assessment tools (via your state SCERT or DIET); NCERT teacher guides; Azim Premji Foundation open-access research; DIKSHA platform content in 36 languages; Tele-MANAS mental health helpline: 14416 or 1800-891-4416; CHILDLINE: 1098.