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In this edition of ⚗️DistillED, we're exploring successive relearning, and a finding that should change how you plan revisiting old content: making the gap bigger every time isn't actually what the evidence supports.
📄 The primary source for this edition is Latimier, Peyre and Ramus's (2021) meta-analysis, which you can find here.
In this edition
📊 Do Now: Quick Poll!
When you revisit old content, what does the gap between reviews usually look like?
What Is Successive Relearning?
Successive relearning is Katherine Rawson and John Dunlosky's term for a simple rule: students have to correctly retrieve the same content on two or three separate occasions, spaced days apart, before you count it as learned. It's retrieval practice and spacing combined into one routine, rather than two good ideas you happen to be doing separately.
Most PD on this topic recommends a specific version of spacing: start with a short gap, then make each one bigger than the last. That's called an expanding schedule, and it's what most retrieval PD decks show you.
🔁 Examples of an Expanding Schedule
A Year 9 Geography teacher tests deforestation content 1 day after teaching it, then again 3 days later, then 7 days later, then 14 days later — the gap growing each time.
A Year 7 French teacher quizzes new vocabulary the next day, then after a week, then after a month.
📅 Examples of Successive Relearning
A Year 10 Chemistry teacher gives the same topic the same weekly Do Now slot — Monday, every week, until it's been answered correctly three times.
A Year 8 History teacher rotates old topics back into the starter on a fixed cycle, not a growing one, and tallies which ones the class has nailed twice already.
Both are retrieval, and both are spaced. The difference is just whether the gap grows or stays roughly the same — and that turns out to matter less than most PD suggests.
👎 Successive Relearning IS NOT
Re-Reading or Re-Teaching — going back over content counts as review, not retrieval.
The Same as Interleaving — mixing topic types within one sitting is a different mechanism entirely.
About Making Every Gap Bigger — the evidence doesn't back that specific version, even though it's the one most commonly taught.
Guaranteed to Work Identically Everywhere — a 2024 study running the same spaced-quizzing design across nine university courses found the benefit was strong in some subjects and barely there in others, so consistent execution matters as much as the schedule itself.
👍 Successive Relearning IS
Retrieval Repeated to a Criterion — the same content, answered correctly 2–3 separate times, not just once.
Built on Successful Retrieval, Not Re-Exposure — producing the answer, not re-reading your slides.
Flexible on Exact Timing — a few days' gap does the job; there's no single "correct" interval to hit.
Do Now-Sized — it fits inside a five-minute starter, not a separate revision block.
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Why Does Successive Relearning Matter?
Most teachers already know that spacing retrieval beats massing it into one sitting. That part of the evidence is about as settled as cognitive science gets. What's less well known is that the specific version most of us were taught to use — start close, then widen the gap each time — doesn't actually have the advantage it's usually given credit for.
Latimier, Peyre and Ramus (2021) pooled 29 studies on this and found a strong overall benefit for spacing retrieval over massing it. But when they looked specifically at expanding schedules against schedules that just kept the same gap throughout, the advantage disappeared:
"Results from subset 2 indicated no significant difference between expanding and uniform spacing schedules of retrieval practice (g = 0.034)."
In plain terms: there was basically no difference — expanding the gaps didn't help students remember any more than keeping them the same.
It's easy to see why expanding schedules feel more effective. Each retrieval attempt lands right as the last one is starting to fade, so it feels harder and more effortful — which is usually a decent proxy for "this is working." But a schedule feeling more effortful and a schedule producing better long-term retention turned out to be two different things. The researchers put the overall picture plainly:
"Results from subset 1 indicated a strong benefit of spaced retrieval practice in comparison with massed retrieval practice (g = 0.74)."
In plain terms: spacing retrieval out, rather than cramming it into one sitting, made a big difference to how well students remembered. Spacing itself is doing the work. The growing gap isn't.
Bottom line: Successive relearning works because:
Spacing retrieval beats cramming it into one sitting, and the effect is large.
Making the gap bigger each time adds nothing — a steady, equal gap performs just as well.
What drives retention is banking successful retrievals, not stretching out the calendar between them.
👉 Read Retrieval Practice for the fuller case for why testing memory strengthens it. This edition builds on that foundation.
School CPD Content
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How Do I Use Successive Relearning?
The objection to all of this is obvious: nobody has time to individually track when every student last correctly retrieved every topic. The point of successive relearning as a classroom routine is that you don't need to — you need a rota, not a spreadsheet.
Step | Explanation | Example |
|---|---|---|
1. Bank the First Retrieval Early
| Test new content again within a day or two of first teaching it, using whatever opening review routine you already run. This comes before the spacing, not instead of it. | A Year 8 Geography teacher covers deforestation on Monday. Tuesday's Daily Review opens with: "Without your notes, list three consequences of deforestation." |
2. Fix the Gap, Don't Expand It
| Give each topic the same recurring slot in a low-stakes retrieval quiz rather than trying to calculate a growing schedule per topic. | A Year 10 Chemistry teacher runs a five-question retrieval quiz every Friday, cycling topics through on a fixed weekly rhythm rather than an ever-lengthening one. |
3. Count Successful Retrievals, Not Days
| Keep a simple tally of correct whole-class retrievals per topic instead of a calendar of review dates. | A Year 7 French teacher uses mini-whiteboards to check the whole class at once, and tallies it on the board: two ticks for être, none yet for the perfect tense. |
4. Rotate Old Topics Into Every Do Now
| Cycle 3–4 older topics into every starter alongside anything brand new, rather than a starter that only covers last lesson. | A Year 9 History teacher's Do Now always has one question on today, three on the last month. |
5. Let a Wrong Answer Trigger the Next Attempt
| If most of the class gets an old topic wrong during cold calling, treat it as the cue for one more spaced attempt before reteaching anything. | A Year 10 Biology teacher cold calls on a photosynthesis question and gets it wrong from most of the class: "That's fine — we'll come back to it Thursday before we reteach it." |
The tally in Step 3 does more work than anything else on this list. A term's retrieval schedule mapped out in advance falls apart the first time a topic needs reteaching or a week gets disrupted. A running tally — this topic has had zero, one, two correct whole-class retrievals — tells you what's actually due next regardless of what the calendar says.
— Jamie
If you want more:
👉 Read Retrieval Practice — the broader evidence base this edition builds on
👉 Read Overt vs Covert Retrieval — why the format of a retrieval attempt matters as much as its timing
👉 Read Daily Review — Rosenshine's case for opening every lesson with review
👉 Read The 'Do Now' — the starter routine successive relearning slots into
👉 Get Retrieval Practice and Review — practical strategies for designing retrieval and review sequences
👉 Get the Review and Practice CPD Collection — a full CPD pack on retrieval, review, and practice
👉 Get the Memory and Cognitive Load CPD Collection — the wider memory research this edition sits within
👉 Get the Poor Proxies for Learning CPD Collection — on the same fluency-vs-retention gap behind why expanding schedules feel more effective than they are
📥 Free Planning Tool
The Successive Relearning Tracker
A one-page tally sheet for tracking successful retrievals per topic instead of review dates — so Step 3 above runs itself. Map your topics down the side, tally correct whole-class retrievals as you go, and the sheet tells you what's due back in the next Do Now.
⚗️DistillED+ Exclusive Member’s Content
This week, ⚗️DistillED+ members get a Successive Relearning CPD PowerPoint and a Successive Relearning Strategy Checklist — walking through the what, why, and how of banking retrievals rather than expanding gaps, so you can plan and audit it across a department.
