Comprehension Depends on Background Knowledge

I remember sitting in a professional development session back in 2014, watching a consultant in a crisp suit explain a complex, multi-layered framework for literacy. He was talking about cognitive load and scaffolding as if we were all teaching in a vacuum, completely ignoring the fact that I had thirty-two Year 8s behind me, two of whom were currently trying to see if a glue stick worked as a projectile. He made it sound like a magic trick, but in reality, most of the academic jargon surrounding how reading for understanding works is just a polite way of overcomplicating something that is actually quite visceral. We spend far too much time buying expensive workbooks and implementing “active reading” strategies that fall apart the moment a student gets distracted by a passing bird outside the window.

I’m not here to sell you a new pedagogical fad or a twenty-step checklist that you’ll abandon by Tuesday. Instead, I want to talk about the actual mechanics of comprehension—the stuff that survives when you’re exhausted and the classroom is loud. We’re going to look at what truly helps a student bridge the gap between decoding words and actually grasping meaning, without needing a PhD to implement it. This is about practicality over prestige, focusing on the small, repeatable shifts that work in a real classroom.

The Messy Reality of Decoding vs Comprehension

The problem is that we often treat reading like a single, seamless action, but in a classroom of thirty, it’s rarely that simple. You’ll have one student breezing through a paragraph while the person next to them is still mentally tripping over the syllables. This is the fundamental tension of decoding vs comprehension. If a student is spending every ounce of their mental energy just trying to sound out “industrialisation,” they have absolutely nothing left to actually think about what the word means in context. They aren’t “struggling with the concept”; they are simply stuck in the mechanics.

When we talk about the cognitive processes in reading, we have to acknowledge that working memory is a finite resource. If the decoding isn’t automatic, the comprehension won’t be either. I’ve seen so many well-meaning teachers try to push complex active reading techniques on students who haven’t even mastered the basics of fluency. It’s like trying to teach someone to write poetry before they’ve learned how to hold a pen. You can’t build a house on a foundation of sand, and you certainly can’t build deep understanding on top of exhausted, struggling decoders.

Why Schema Theory in Reading Saves Your Sanity

Now, I know “Schema Theory” sounds like one of those academic terms designed to make people in suits feel important during a CPD session, but in a real classroom, it’s actually your best friend. At its heart, it’s just about what a student already knows. If you ask a Year 7 to read a text about the Industrial Revolution and they have zero mental hooks to hang that information on, they aren’t “struggling with literacy”—they are essentially staring at a wall of meaningless symbols. They can decode the words perfectly fine, but nothing sticks because there is no existing structure to catch it.

This is where you can actually save yourself a massive amount of headache. Instead of throwing more complex active reading techniques at them and hoping for the best, spend five minutes building that mental scaffolding first. Whether it’s a quick visual, a shared anecdote, or just a blunt conversation about what they already know, you are essentially priming their brains. When you bridge that gap between their current knowledge and the new text, you aren’t just teaching them to read; you are improving reading retention by making sure the information actually has a place to land.

Five Ways to Stop Them Staring Blankly at the Page

• Stop treating every text like it’s sacred. If you’re handing a Year 8 class a dense, three-page source document without first building the scaffolding, you aren’t teaching reading; you’re just supervising a collective staring contest. Give them the context, the vocabulary, and the “big picture” before you ever ask them to dive into the actual prose.
• Use “low-stakes” verbal summaries to check the gears are turning. Before you move on to the high-level analysis, ask them to tell their partner—in plain, non-academic English—what that paragraph actually just said. If they can’t explain it to a mate, they haven’t read it; they’ve just moved their eyes across the ink.
• Focus on the “glue” words, not just the big nouns. We spend so much time drilling Tier 2 vocabulary lists that we forget the importance of the connectors—the however, the consequently, the despite. If they don’t understand how those words signal a change in direction, the whole logic of the text collapses, no matter how many definitions they’ve memorised.
• Don’t let them “skim and scan” as a default setting. While those are useful skills for a scavenger hunt, they are the enemies of deep comprehension. If the task is to understand an argument, they need to slow down. I tell my trainees: if you’re moving too fast to feel slightly annoyed by the complexity, you’re probably not actually reading.
• Build on what they already know, even if it feels repetitive. It feels like a waste of time to spend ten minutes talking about the historical context of a text before they read it, but that’s where the comprehension happens. You’re building the mental hooks they need to hang the new information on. Without those hooks, the text just slides right out of their heads the moment the bell rings.

The Reality Check: What to Actually Carry Into the Classroom

Stop treating ‘reading’ as a single skill; if a student is struggling to decode the words, no amount of high-level questioning about ‘inference’ is going to help them.

Focus on building the background knowledge (the schema) before you hand out the text, because asking a student to comprehend a topic they know nothing about is just a recipe for frustration for both of you.

Forget the complex, multi-step reading frameworks that look great in a CPD handbook; prioritize helping them connect new information to what they already know, especially when you only have twenty minutes of actual focus time.

The Illusion of Reading

“We often mistake a student’s ability to scan a page for the ability to actually grasp it. You can have the most sophisticated comprehension strategy in the world, but if the student hasn’t got the mental hooks to hang those new words on, you aren’t teaching reading—you’re just watching them perform the ritual of looking at paper.”

Ellery Mwangi-Selkirk

The Reality Check

So, let’s strip away the jargon for a moment. We’ve talked about why a student can “read” every single word on a page and still have absolutely no idea what they’ve just looked at. It’s not a lack of intelligence; it’s a lack of structural scaffolding. If they haven’t got the decoding down, or if they haven’t got the background schema to anchor new information, you’re essentially asking them to build a house on a swamp. You can hand them all the high-level comprehension question booklets in the world, but if you haven’t addressed the gap between seeing words and building meaning, you’re just wasting your precious planning time and theirs.

Look, I know the pressure is on to move through the curriculum at breakneck speed, and I know how tempting it is to just move on to the next chapter when the class looks blank. But don’t let the “coverage” trap win. It is far better to spend an extra twenty minutes helping a small group actually connect the dots than to rush through ten pages that leave them more confused than when they started. Teaching isn’t about checking boxes on a scheme of work; it’s about those small, quiet moments when a student finally says, “Oh, I get it.” That is the only metric that actually matters when the bell rings at the end of the day.

About Ellery Mwangi-Selkirk

Most educational advice is written for a classroom that does not exist — twenty motivated pupils, unlimited preparation time, no behaviour to manage. I write for the room you are actually in. What retrieval practice looks like when marking is already three weeks behind, why the seating plan matters more than the starter activity, and which of the last decade's initiatives left anything behind. Nineteen years taught me that the good ideas survive contact with a wet Wednesday and the rest do not.