Spaced Repetition
Forget, then retrieve — that’s where the learning happens.
What the Research Says
The brain remembers things better when you review them just as you’re about to forget them. Cram everything the night before and it’s gone within a week. Revisit the same material on day one, day three, day seven, day fourteen and it sticks for months. This is the single biggest difference between students who peak in mocks and students who peak in the real exam.
Evidence Base
| Study | Finding | Impact |
|---|---|---|
| Ebbinghaus (1885) | Without revisiting, 50% of what you learn is lost within an hour and 80% within a day. | The forgetting curve is real — and steeper than most students realise. |
| Cepeda et al. (2006) | Meta-analysis of 254 studies: spaced practice beat massed practice in 259 out of 271 comparisons. | Spacing works across ages, subjects, and skills. |
| Kang (2016) | Optimal gap ≈ 10–20% of the time until the test. For a May exam, that means revisiting material every 3–6 weeks from the start of your course. | You can plan exactly when to revisit a topic. |
| Sisti et al. (2007) | Neurons form stronger connections during the “almost forgotten” moment of retrieval. | Struggling to recall IS the learning, not a sign you’ve failed. |
Step-by-Step Method
- 1Learn a topic today — read the lesson, watch the video, write notes. Mark it in a diary or app with today’s date.
- 2Review in 24 hours — do a retrieval practice brain dump, or redo the knowledge check. 5–10 minutes.
- 3Review again in 3 days — if you got it right yesterday, push the gap. Repeat the retrieval.
- 4Review again in 7 days — by now the material is consolidating into long-term memory.
- 5Review again in 2–3 weeks — gap the next review to 14 days, then 30, then 60.
- 6If you fail a review — reset the schedule. Back to day 1. Don’t skip the reset — it’s the point of the system.
You study the material categories on Monday: ferrous metals (steel, cast iron), non-ferrous metals (aluminium, copper, brass), polymers (PP, PE, PVC, PMMA, PET), and composites (CFRP, GFRP, concrete). On Tuesday, brain-dump all four categories with every named material and one distinctive property for each. On Thursday, redo the dump, this time adding one engineering application for each material — for example, “aluminium: low density and corrosion-resistant, used in aircraft fuselage panels at Castleton Aerospace Components.” The following Monday, attempt a timed ‘state two properties of X and explain why it is suitable for Y’ question cold. Each review takes under 10 minutes; the spacing means the full material taxonomy feels automatic by exam day.
After first covering the calculation topics, log each formula on a revision tracker. Day 1 review: write from memory density (ρ = m/V), pressure (P = F/A), stress (σ = F/A), strain (ε = ΔL/L), and Young’s modulus (E = σ/ε), plus gear ratio and mechanical advantage. Day 7 review: attempt the same recall without notes, then substitute values for a worked example: “A steel rod of cross-section 0.002 m² supports a load of 50 kN — calculate the stress.” Day 21: answer a multi-step calculation question cold. Formula recall is the most reliably lost skill under exam pressure — spaced review directly targets that gap.
Common Pitfalls
- Reviewing too often. If it’s easy, the gap is too short. Make it harder by stretching the interval.
- Reviewing too late. If you’ve completely forgotten, you’re essentially re-learning from scratch — you lose the benefit of spacing.
- No written schedule. Spaced repetition works only if you actually do the reviews. Use a calendar, the StudyVault flashcard system, or a simple Leitner box.
- Skipping resets when you fail. If you couldn’t recall the material, you haven’t learnt it — regardless of how far through the schedule you were.
When to Use This
This is the organising principle of your whole revision year — not a technique you pull out near the exam. From the first lesson of your course, log every topic you cover and schedule reviews at 1 day, 3 days, 7 days, 14 days, and 30 days. The StudyVault flashcard system does this automatically via the Leitner method — questions move between five boxes with intervals of 1, 2, 4, 7, and 14 days. When a card comes up, do it.