Same Hours, Spread Out, Better Results

I was sitting in a middle leadership meeting three years ago, staring at a shiny new “Learning Science” toolkit that promised to revolutionise our department. It was full of complex, colour-coded spreadsheets and software subscriptions designed to track every single cognitive leap a student makes. It was absolute nonsense. All that expensive tech was trying to explain how spacing improves retention, but it completely ignored the reality of a Year 9 class on a Friday afternoon when the radiator is clanking and half the room is staring blankly at the whiteboard. We don’t need more apps; we need to understand the actual mechanics of memory without the academic fluff.

I’m not here to give you a lecture on cognitive load theory that you can’t actually use when you’re thirty minutes into a lesson and running behind. Instead, I want to talk about what spacing looks like when you have zero extra prep time. I’ll show you how to weave it into the lessons you’re already teaching, so you can stop teaching the same thing three times in a week and actually start seeing it stick. This is about practical, messy, classroom-tested reality.

Distributed Practice vs Massed Practice Fighting the Cramming Urge

We’ve all seen it. It’s the frantic energy of a Year 11 class on a Tuesday afternoon, staring at a textbook they haven’t opened since September, trying to swallow three modules of content in one go. That’s massed practice—the academic equivalent of trying to eat a three-course meal in a single mouthful. It feels productive because the information is right there in front of them, but it’s an illusion. They aren’t learning; they’re just temporarily holding onto data until the bell rings.

The real work happens when we lean into distributed practice vs massed practice. Instead of that one massive, exhausting block of teaching, we need to break it up. It’s about the cognitive science of memory telling us that the brain actually needs a bit of struggle to make things stick. If you give them everything at once, they’ll forget it by Friday. But if you sprinkle those concepts across the next three weeks, you’re actually forcing the brain to do the heavy lifting of long-term memory consolidation. It’s less efficient in the moment, sure, but it’s the only way to ensure they actually remember it when the exam papers are on the desk.

Long Term Memory Consolidation Beyond the Initial Spark

Here is the reality of what’s happening under the hood: when we teach a concept, we’re essentially throwing a match into a dark room. It’s bright, it’s immediate, and for a second, everyone sees the furniture. But if we don’t keep relighting that match at specific intervals, the darkness settles back in just as quickly. This is the core of long-term memory consolidation. It isn’t a single “aha!” moment that happens during a brilliant lesson; it’s a slow, grinding biological process where the brain decides what is worth keeping and what is just background noise.

If we only hit a topic once—the classic “teach it and move on” approach—we are essentially relying on luck. To actually fight the inevitable slide of forgetting, we have to lean into the cognitive science of memory by interrupting that decay. It’s about catching the information just as it’s starting to slip away. I’ve seen too many departments try to “fix” retention by adding more content to the scheme of work, when what they actually need is more breathing room between revisits. It’s not about how much you pack into a single Tuesday; it’s about how you weave it back into the fabric of the following weeks.

Five ways to make spacing work when you've actually got a life to live

• Stop trying to plan a three-month revision schedule. If you’re staring at a pile of books and a lesson plan that needs doing by tomorrow, just aim for the ‘rule of three’: touch a concept today, touch it again in three days, and once more next week. It’s not perfect, but it beats the ‘one and done’ approach that leaves them blanking during the end-of-term assessment.
• Use the first five minutes of your lesson for ‘low-stakes’ retrieval, but don’t make it new stuff. If you’re teaching the Tudors today, spend those five minutes asking about the Normans from last month. It feels like a waste of time when you’re rushing to get through the curriculum, but that’s exactly when it matters most.
• Ditch the fancy apps and digital trackers. Honestly, a simple ‘retrieval grid’ on a photocopied sheet—where half the questions are from the current unit and half are from three weeks ago—is more effective than any expensive software that requires a login and a prayer to work.
• Don’t wait for the ‘revision unit’ to start spacing. If you wait until the week before exams to revisit anything, you’ve already lost the battle. Weave the old stuff into the new stuff as you go. It’s harder to plan, I know, but it saves you from the frantic, ineffective cramming sessions that do nothing but stress everyone out.
• Be honest with the kids about why we’re doing it. They’ll naturally want to focus on what they’re learning right now because it feels productive. Tell them, “I know this feels like we’re going backwards, but we’re actually making sure this stuff doesn’t vanish by Friday.” They’re smarter than the textbooks give them credit for.

The reality check: How to actually use spacing

Stop trying to build a perfect, automated revision schedule; just aim to revisit a key concept from last Tuesday during this Friday’s starter, even if it feels slightly repetitive.

Accept that ‘cramming’ is a seductive lie that feels like learning but is actually just temporary familiarity; true retention requires the discomfort of trying to remember something you haven’t seen for a week.

Don’t let the pursuit of ‘perfectly spaced’ intervals become another thing on your to-do list—if you can’t do a complex rotation, just ensure you aren’t teaching the same topic in isolation for three weeks straight without looking back.

The myth of the deep dive

We often mistake a single, intense lesson for ‘mastery’ because it feels productive in the moment, but true learning isn’t a one-off explosion of effort; it’s the slow, repeated nudge of revisiting a concept just as it’s starting to slip away. If you don’t space it out, you aren’t teaching them—you’re just hosting a very expensive, very temporary acquaintance with the facts.

Ellery Mwangi-Selkirk

The Reality of the Long Game

Look, I know the temptation. When you’re staring at a syllabus that feels three months too long for a term that’s already gone sideways, the instinct is to just keep going. You want to push through the content, finish the unit, and tick the box. But we’ve seen what happens when we do that: the kids “learn” it for the Friday test and forget it by Monday morning. Spacing isn’t about adding more to your plate; it’s about slowing down just enough to let the dust settle. It’s the difference between a flash in the pan and a steady flame. If you can find even five minutes to revisit a concept from two weeks ago, you’re doing more for their long-term memory than any high-tech, shiny new curriculum initiative ever could.

At the end of the day, teaching isn’t about the perfect lesson plan or the most sophisticated cognitive science apps. It’s about the quiet, often messy work of helping human beings actually retain what we tell them. Some days, the bell will ring and you’ll feel like you haven’t covered enough ground. On those days, remember that depth beats breadth every single time. You aren’t just delivering information; you’re building a foundation. It’s exhausting work, and it’s rarely flashy, but it’s the only way we actually make the learning stick.

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.