District leaders across the country are investing in Science of Reading-aligned instruction – and for good reason. When schools strengthen foundational skills like phonemic awareness and phonics, students often make measurable gains in early reading.
But many administrators are noticing a familiar – and frustrating – pattern:
Students can decode words accurately… yet comprehension still falls short.
Or progress looks strong in K–2, but performance stalls by upper elementary and middle school.
That gap shouldn’t come as a surprise. In fact, it’s a clear signal educators should notice and act on.
The next phase of literacy improvement requires districts to look beyond how students read and focus more intentionally on what students know – because reading comprehension depends on background knowledge and vocabulary.
The district-level problem: Students can “read,” but they can’t understand
In many classrooms, students can sound out words and read aloud with growing fluency, but they struggle when texts become more complex. This often shows up as:
- weak performance on comprehension-heavy assessments
- difficulty understanding grade-level informational text
- limited academic vocabulary across content areas
- challenges with inferencing, summarizing, and analysis
- gaps that widen over time, especially for multilingual learners and students who have experienced interrupted learning
As a result, even students who can decode and read fluently often fall further behind. And the comprehension demands just keep increasing (and increasing).
The missing link: Background knowledge builds comprehension
Time to tackle a common misconception: that comprehension is a single skill students just “master” once and apply everywhere. It isn’t. Comprehension is a complex skill set that depends heavily on:
- topic familiarity
- vocabulary knowledge
- language comprehension
- exposure to rich content over time
A student may read a story about a familiar topic with confidence, but struggle with a text on an unfamiliar subject (even if the reading level is similar).
That’s why two students with the same decoding ability can have completely different comprehension outcomes.
Knowledge acts like a bridge between the words on the page and meaning.
Why the Science of Reading matters now more than ever
Science of Reading-aligned instruction is essential. Districts should absolutely protect time for:
- systematic phonics
- explicit foundational skill instruction
- fluency development
- structured practice and feedback
But Science of Reading goes far beyond these foundational skills. In fact, if students don’t build vocabulary, and knowledge, and comprehension as they move through grades, districts can see early gains fade over time. That’s when leaders start hearing:
- “Our intervention groups keep growing.”
- “Our benchmark results aren’t improving fast enough.”
- “We’ve strengthened phonics, but comprehension isn’t moving.”
This is the exact moment where districts benefit from a broader literacy approach – one that strengthens Tier 1 instruction by intentionally building knowledge alongside skills.
What strong Tier 1 literacy systems do differently
What districts that build lasting reading success have in common? They’ve stopped treating comprehension as a standalone block and started creating instruction that systematically builds:
- decoding ability
- vocabulary
- background knowledge
- oral language
- comprehension through meaningful content
Below you’ll find four high-impact ways leaders can support that shift. But first — would you like access to the full resource?
This blog highlights a few of the key takeaways, but the complete article goes deeper into why knowledge-building is essential for comprehension and outlines practical, district-friendly ways to strengthen Tier 1 instruction.
➡️ Download the full resource: The Great Debate: Reading Skills vs. Content Knowledge.
1) Use read-alouds to build knowledge at every grade level
Read-alouds are often viewed as an early elementary practice, but they’re a powerful tool across grades, especially when districts choose texts intentionally.
Read-alouds help students access:
- complex ideas and vocabulary
- academic language structures
- content knowledge they may not encounter otherwise
They also reduce barriers for:
- multilingual learners
- striving readers
- students who need repeated exposure to new concepts
District move: Encourage read-alouds as a daily knowledge-building routine. Not just in ELA – in science and social studies as well.
2) Build coherence with knowledge-rich text sets
Text sets allow students to read multiple texts connected to a topic (for example: ecosystems, weather patterns, civil rights, or space exploration).
Instead of bouncing from topic to topic, students build knowledge through:
- repeated exposure to key ideas
- related vocabulary appearing across texts
- multiple formats (articles, biographies, primary sources, narratives)
Text sets support comprehension because, rather starting from zero each time, students accumulate knowledge and use it to make meaning.
District move: Adopt or build text sets aligned to grade-level content standards, so literacy supports science and social studies (not competes with them).
3) Strengthen vocabulary instruction as a Tier 1 priority
Vocabulary is one of the most powerful predictors of comprehension. Counterintuitively, it’s also often the missing ingredient in struggling literacy systems.
Strong Tier 1 vocabulary instruction is:
- explicit (not assumed)
- connected to content students are learning
- reinforced across multiple exposures
- supported through discussion and writing
Rather than trying to teach “all the words,” effective instruction focuses on words that:
- are essential to understanding the text
- will appear across units or subject areas
- show up in academic discussion and writing
District move: Ensure vocabulary is built into core instruction and supported through coaching, pacing guidance, and consistent routines.
4) Use multimedia strategically to build background knowledge
Images and short videos can help students understand new topics, especially when content is abstract or unfamiliar.
But there’s one thing educators should keep in mind about multimedia: it is most effective when it’s used as a tool for learning. It can’t be used as a replacement for reading.
Strong multimedia use includes:
- an essential question before viewing
- structured discussion during and after
- attention to academic vocabulary
- explicit instruction on visual literacy and source credibility
District move: Encourage teachers to use multimedia as an “on-ramp” to complex texts and content. Discourage using it as the end point.
What district leaders can look for when evaluating literacy programs
When reviewing instructional programs or supplemental tools, leaders can ask:
- Does the program support systematic foundational skill development?
- Does it intentionally build vocabulary and content knowledge over time?
- Are students exposed to rich, varied texts—not isolated passages?
- Does it reinforce comprehension through knowledge-building experiences?
- Can it be implemented within Tier 1 instruction at scale?
- Does it provide actionable data that supports instruction and intervention decisions?
The strongest programs support both sides of the equation: skills and meaning.
The bottom line: Comprehension requires skills and knowledge
The most effective literacy systems shift focus from reading as a technical exercise to building readers who can:
- decode accurately
- read fluently
- understand complex texts
- learn from what they read across subjects
That means instruction that’s both research-aligned and balanced. Comprehension needs both things working together: strong foundational skills and the knowledge that makes understanding possible.
How Reading Eggs supports those skills + knowledge
Reading Eggs supports Science of Reading-aligned instruction through explicit foundational skill development, while also helping students build vocabulary and background knowledge through a library of digital books and comprehension activities.
Want to see how it could support your district’s Tier 1 literacy goals?
Request a demo or connect with our team to learn more.
