---
title: "Retrieval practice: What the Research Says"
description: "Plain-language summaries of studies on retrieval practice (the testing effect): methods, findings, effect sizes and limitations."
canonical: https://research.askpoppy.ai/topics/retrieval-practice/
last_updated: 2026-10-21
---

# Retrieval practice (the testing effect): research in plain words

Pulling information out of memory, by quizzing, blurting or flashcards, is one of the best-replicated ways to make learning last.

## Summaries (2)

### [Quizzing boosts classroom learning: a meta-analysis of 222 studies](/papers/yang-2021-testing-boosts-classroom-learning-meta-analysis/)

Chunliang Yang et al. (2021) · Systematic review and meta-analysis · Peer-reviewed

Across 222 studies in real classrooms with 48,478 students, low-stakes quizzing improved achievement by a medium amount compared with restudying and other strategies. Feedback, repeated quizzes and quiz questions that match the final test all changed how big the benefit was.

### [The classic study: testing yourself beats rereading after a week](/papers/roediger-karpicke-2006-test-enhanced-learning/)

Henry L. Roediger III et al. (2006) · Lab experiments (landmark classic) · Peer-reviewed

Students who read a passage and then tried to recall it from memory remembered more two days and one week later than students who simply read it again. Rereading won only on a test five minutes later, and it made students more confident, which is part of why rereading feels better than it works.

## Free tools for this

- [Active recall flashcards from your notes](https://learn.askpoppy.ai/recall/)
- [Blurting method tool](https://learn.askpoppy.ai/blurt/)
- [7-day learn-out-loud challenge](https://learn.askpoppy.ai/learn-out-loud/)

Each summary says what the researchers did, who took part, what they found, the limitations, and whether we read the full paper or only the abstract.

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