Case Study 1: 500 Words in 60 Days with Spaced Repetition
Sofia had studied Spanish for three years in high school and remembered approximately nothing.
She could say "hola" and "gracias" and could recognize "no habla inglés." Her actual productive vocabulary — words she could produce in conversation — was probably under fifty words. Three years of formal instruction, and she was functionally a complete beginner.
At twenty-four, she decided to try again. She was going to visit her boyfriend's family in Bogotá in eight months and was determined to be able to hold a basic conversation.
She didn't sign up for a class. She didn't download Duolingo (though she did try it briefly and found it gamey but somewhat useful for motivation). What she did was build an Anki deck.
The Setup
Following the approach described in this chapter, Sofia found a Spanish frequency list online — specifically, the Spanish Word Frequency List from the Spanish Frequency Dictionary series, which ranked Spanish words by their frequency in contemporary Spanish text and conversation. She started from word number 1.
She set up her Anki deck with two card types for each word:
Recognition card (L2 → L1): - Front: the Spanish word in a simple sentence (e.g., "Necesito ir al banco." with "necesitar" highlighted) - Back: "to need" + the sentence translated + a note about usage if relevant
Production card (L1 → L2): - Front: "to need (Spanish)" - Back: "necesitar" + the example sentence
She added audio to every card using the Spanish TTS (text-to-speech) function built into Anki. Not perfect pronunciation, but good enough to hear the phonology.
Her daily target: 15 new words per day, 20 minutes of review.
The First Two Weeks: Resistance and Adjustment
The first two weeks were rocky.
Day 3: "I have way too many reviews already. Something's wrong." (She'd rated too many early cards as "Easy," which pushed their intervals out and then caused a flood of mature cards to return simultaneously two weeks later. She adjusted to rating cards more conservatively.)
Day 7: "I'm remembering recognition cards much better than production cards. The L1 → L2 cards are killing me." (This is normal and expected. Production is harder than recognition. She considered dropping the production cards but kept them based on the principle that production practice produces more durable learning.)
Day 10: "I accidentally reviewed for 35 minutes and didn't notice." (The turning point. When you start feeling the words connecting to real things — sounds, images, associations — the deck stops feeling like a chore.)
Days 1–60: The Numbers
Sofia tracked her progress in a simple spreadsheet.
| Period | New Words Added | Mature Cards | Daily Review Time |
|---|---|---|---|
| Days 1–10 | 150 | 0 | 15–20 min |
| Days 11–20 | 150 | 38 | 20–25 min |
| Days 21–30 | 150 | 127 | 20–25 min |
| Days 31–40 | 150 | 231 | 22–28 min |
| Days 41–50 | 150 | 342 | 22–28 min |
| Days 51–60 | 150 | 473 | 25–30 min |
At day 60, Sofia had 900 cards in her deck (450 words × 2 card types), of which 473 were "mature" (seen at intervals of 21+ days and consistently recalled). She had missed review on four days (two days of travel, two days of illness) and had pushed back to normal review quickly both times.
The test: On day 60, she went through 100 words selected randomly from her deck on paper, covering the "back" sides, and tried to produce the Spanish translation of each English word. Her success rate: 78%.
That's 78 words she could produce correctly out of 100 randomly drawn from her frequency-list vocabulary — roughly equivalent to knowing the first 400–500 most common Spanish words productively.
What This Means in Practice
Five hundred high-frequency Spanish words is not conversational fluency. But it's something very specific and very real:
- It's enough vocabulary to understand the gist of simple conversations
- It's enough to read children's books and very simple beginner readers with a dictionary for gaps
- It's enough to construct basic sentences in real conversation (with gaps that need circumlocution)
- It's a foundation that every subsequent hour of Spanish study builds on directly
For comparison: research suggests that a typical three-semester university Spanish sequence (180+ classroom hours) produces vocabulary knowledge of approximately 1,500–2,000 words at a recognition level. Sofia built 500 production-level words in 60 days with 20–30 minutes of daily study — and unlike the cramming-for-exam approach typical in language courses, her words were not going to fade after finals.
The Next Phase
At 60 days, Sofia continued her vocabulary deck (dropping to 10 new words per day to allow more time for other activities) and added two new elements:
Comprehensible input: She started with a free Spanish graded reader at A2 level. Reading 20–30 minutes per day, looking up unknown words and (if they seemed common) adding them to her Anki deck.
Language exchange: She found a language partner through a language exchange app — a woman in Mexico City learning English. They spoke twice a week: one session focused on Sofia's Spanish, one on her partner's English.
By the time she flew to Bogotá at the eight-month mark, Sofia had a vocabulary of approximately 1,800 known words, could hold a halting but real conversation, and had enough listening comprehension to understand most of what her boyfriend's family said to her (if they spoke somewhat slowly).
Was she fluent? No. Was she able to make genuine, warm connection with his family in their language? Yes.
What Made the Difference
When Sofia reflects on why this worked where high school Spanish failed:
Retention, not just exposure. High school Spanish exposed her to words. The SRS made her retrieve them repeatedly until they stayed. These are genuinely different activities, and only one of them produces durable memory.
Daily consistency over volume. She never studied for more than 30 minutes on any given day. The consistency mattered more than any single session.
Both directions. She initially wanted to drop the harder L1 → L2 production cards. Keeping them doubled her useful vocabulary acquisition — she was building the ability to speak, not just to recognize.
The frequency list prioritization. She didn't study the words that seemed interesting or fun. She studied the most common words first. Every word she learned was maximally useful because of its frequency in real Spanish.
This is what spaced repetition vocabulary acquisition actually looks like in practice: unglamorous, consistent, cumulative, and — over the medium term — dramatically effective.