The Forgetting Curve (Ebbinghaus, 1885):
Your brain forgets information FAST if you don't review it:
This is why students say: "I learned this in class, but forgot by the next day!"
Why This Happens (Brain Science):
When you learn something new (e.g., how to pronounce "th" correctly), your brain creates a weak neural pathway. If you don't use that pathway again, your brain "erases" it to save energy (you're not using it, so it can't be important).
To keep the pathway strong, you MUST review the information at specific intervals.
What is Spaced Repetition?
A learning technique where you review information at increasing intervals. Each review happens JUST BEFORE you forget.
Result: 95% retention instead of 10% retention.
Timing: Same evening as lesson (2-8 hours later)
What to do: Watch your lesson recording, review notes, or redo exercises
Why: Refreshes the neural pathway before it fades
Example: Lesson at 6pm → Review recording at 9pm
Timing: Next day (24 hours after lesson)
What to do: Recall 3 key things from lesson (without looking), then check notes
Why: You've already forgotten 50%, so this review is critical
Example: Lesson Monday → Review Tuesday morning
Timing: 3 days after lesson
What to do: Practice the skill (e.g., record yourself doing the exact exercise from lesson)
Why: Long-term memory formation begins here
Example: Lesson Monday → Practice with voice memo Thursday
Timing: 7 days after lesson
What to do: Full practice session using lesson material (15-20 min)
Why: At 7 days, you've forgotten ~70%, so you need a full "relearning"
Example: Lesson Monday → Full practice session the following Monday
Timing: 2 weeks, then monthly
What to do: Quick review + practical use (record yourself, use in real conversation)
Why: Once material is in long-term memory, monthly reviews keep it alive
Example: Lesson Mon Jan 1 → Quick review Mon Jan 15 → Monthly check-in Feb 1
📊 The Spaced Repetition Effect (Visual)
Memory Retention Over Time
═══════════════════════════════════════════════════════════════
WITHOUT Spaced Repetition (Forgetting Curve):
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
100% │ ╲
│ ╲___
50% │ ╲___
│ ╲___
0% │______________╲_________ → After 1 month: 90% forgotten
Day 1 Day 3 Day 7 Day 30
WITH Spaced Repetition (Optimized Retention):
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
100% │ ╱╲ ╱╲ ╱╲ ╱╲
│╱ ╲╱ ╲╱ ╲╱╲
95% │ ╲_____ → After 1 month: 95% REMEMBERED
│
│R₁ R₂ R₃ R₄ R₅
Day 0 Day 1 Day 3 Day 7 Day 14+
Days
Each review bump = another review session
Key insight: The memory "decay" curve gets flatter after each review. Eventually, it stays at ~95%.
Review 1: Remember for 1 day Review 2: Remember for 3 days Review 3: Remember for 7 days Review 4: Remember for 14 days Review 5: Remember for 30+ days (permanent long-term memory)
Track reviews with a simple calendar or notebook.
Apps automate the scheduling. When you're ready to review, the app tells you.
Use spaced repetition for these types of learning:
| Learning Type | Good for Spaced Repetition? | Example |
|---|---|---|
| Vocabulary | ✅ EXCELLENT | Create flashcards: "business terms", "phrasal verbs", "idioms" |
| Pronunciation patterns | ✅ EXCELLENT | Record yourself saying "-ed endings", "-th sounds", specific words |
| Grammar rules | ✅ EXCELLENT | Flashcards: "When to use present perfect vs. simple past" |
| Phrases/Idioms | ✅ EXCELLENT | Create: "20 business English phrases" as cards |
| Speaking fluency | ⚠️ PARTIAL | Good for reviewing dialogue framework, but need live practice too |
| Listening comprehension | ⚠️ PARTIAL | Good for reviewing key phrases, but need to listen to actual audio |
| Real conversation | ❌ NOT GOOD | Spaced repetition helps memory, but speaking requires live practice |
❌ "I'll remember from the lesson alone"
✅ You MUST review 5 times between lessons for 95% retention
❌ "I review the same day, then again 2 days later"
✅ Follow the 5R timing: Same day → Day 1 → Day 3 → Day 7 → Day 14+
❌ "I review 2 weeks after the lesson"
✅ By then, you've already forgotten 90%. Too late. Review days 1, 3, 7 are critical.
❌ "I have Anki, so I don't need a strategy"
✅ Apps schedule reviews, but you still need to create WHAT to review
❌ "I create 100 flashcards and review them all daily"
✅ Start with 10-20 cards per lesson. Spaced repetition works because it's SMALL + FREQUENT
❌ "I memorize the rule but never record myself saying it"
✅ Language learning = muscle memory. Must practice speaking + recording in reviews
Without a study plan → You don't know what to review in spaced repetition.
Without spaced repetition → You study, but forget everything in a week.
Together = Complete system for adult learning.
A: 15-20 minutes per day on average. It's NOT an extra burden. You're reviewing the same material, just at strategic intervals instead of cramming.
A: Partially. Spaced repetition is GREAT for memorizing phrases, vocabulary, rules. But speaking fluency also requires live conversation practice. Use spaced repetition for the "memory" part, live practice for the "fluency" part.
A: It's okay. Just do the review whenever you can, then get back on schedule. The dates aren't magic—it's the PATTERN (small + frequent reviews) that works.
A: Start with Anki (free, powerful) or Quizlet (easier UI). Both have spaced repetition built-in. Use whichever feels less annoying to you—consistency matters more than perfection.
A:
A: No. It works for vocabulary, grammar, pronunciation patterns, phrases, idioms, listening comprehension notes—basically any "discrete" information you need to memorize. Speaking fluency requires live practice too, but spaced repetition helps with the knowledge part.
A: Normal studying = cramming (study hard the night before, forget after). Spaced repetition = small reviews at optimal intervals. Your brain retains 95% instead of 10%. It's backed by 150+ years of neuroscience research.
A: YES, absolutely. Tell Tim you're doing spaced repetition. Tim can make sure to include the content you'll review (e.g., "We learned 20 phrases today—add these to your Anki deck and review them at home").
⏱️ Time Investment: 10 minutes learning to use an app = 3-6 months of better retention.
Spaced repetition is the #1 tool for adult language learners.