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5 min readlearning / training

Teaching from a script matched no review at all: teach from memory

On day two of my trainings each group presents its build to the room. Those groups retain more of the material, and for a long time I credited the presenting. Four experiments and two meta-analyses split the credit differently. Most of the work happens before anyone stands up, and the standing up pays off only when the notes are closed.

What the research shows.

John Nestojko and colleagues handed students a passage and a cover story. One group expected a test on it. The other expected to teach it to another student. Everyone took the test, nobody taught anyone. The teaching group recalled 17% of the passage's idea units against 13%, produced them faster (1.50 idea units per minute against 1.02), organized the recall better, and remembered the more important information better 1. One sentence about a future audience changed how they read.

Tricia Guerrero and Jennifer Wiley ran the same manipulation on expository texts across two experiments. Expecting to teach improved memory for the text and comprehension of it, and the advantage held after a delay. In the notes people took while studying, Guerrero and Wiley could see the teach-expectancy readers working the text harder 2.

Keiichi Kobayashi pooled 28 studies. Preparing to teach and then stopping there returned g = 0.35 (95% CI 0.27 to 0.44). Preparing and then teaching returned g = 0.56 (95% CI 0.52 to 0.61). The teaching benefit grew when the session let the audience interrupt rather than sit through a delivery 3.

Logan Fiorella and Richard Mayer located the seam between the two halves. Undergraduates studied a lesson on the Doppler effect. Some expected a test, some prepared to teach, some prepared and then recorded a video lecture. On an immediate comprehension test both teaching conditions beat the control: d = 0.82 for the ones who taught, d = 0.59 for the ones who only prepared. One week later the teachers held at d = 0.79 while preparation alone fell to d = 0.24, no longer separable from the control group 4.

The notes have to be closed.

Aloysius Koh, Sze Chi Lee and Stephen Lim built the comparison that isolates the mechanism. Four groups studied the same text. The control solved arithmetic problems and never returned to it. One group taught the material aloud with nothing in front of them. One group taught it aloud while reading the script they had prepared. One group skipped teaching and took a free recall test. On a comprehension test one week later, teaching without notes and free recall finished level with each other, both ahead of the rest. Teaching from the script scored like the control group that never reviewed the material at all 5.

Reading your own explanation out loud is a performance. The audience may learn from it; the speaker does not. Pulling the content back out of memory is the part that pays, which is why a plain recall test bought the same week-later score as teaching a person.

Announce the teach-back before the material opens.

Kobayashi returned in 2024 and split the studies by when learners were told. Adding a teaching episode after study raised learning by g = 0.27 (95% CI 0.15 to 0.39) over studying alone. That average breaks in two: g = 0.48 (95% CI 0.34 to 0.63) when they studied knowing they would teach, and g = -0.02 (95% CI -0.14 to 0.11) when the request reached them after they had finished studying 6. A teach-back sprung on a room at the end of a module buys nothing.

The protocol.

  1. Say who they will teach before anyone opens the material. Name the audience and the slot: "in 40 minutes you explain this to the other three." The same request made afterwards returns g = -0.02 6.
  2. Give study a hard stop and let people take notes. 20 to 30 minutes for a module or a chapter. This is the phase where Guerrero and Wiley saw the difference 2.
  3. Collect the notes before the explanation starts. Laptops shut, paper face down. Koh's script readers ended the week where the group that never reviewed ended it 5.
  4. 3 to 5 minutes out loud, from memory. One colleague, a phone camera or an empty room all qualify. Expect gaps and hesitation, and keep going rather than reaching for the notes.
  5. Give the listener one job: interrupt when an explanation stops making sense. Interactive teaching outperformed one-way delivery in the pooled studies 3.
  6. Hand the notes back for a 2-minute gap check. Each person lists what they could not produce, then restudies that and nothing else.
  7. Test at one week, not before people leave the room. Same-day scores flatter preparation (d = 0.59 against d = 0.82). By day 7 preparation alone drops to d = 0.24 4.
  8. Working alone, write the audience down. At the top of a chapter or a set of docs, put "explain this to Marie on Friday." Then do it on Friday with the page closed.

Take the next module you run and move one line to the top of the agenda: who each person will teach, and at what time. Then set a reminder for minute 31 to collect the notes.

Sources.

  1. Nestojko, J. F., Bui, D. C., Kornell, N., & Bjork, E. L. (2014). Expecting to teach enhances learning and organization of knowledge in free recall of text passages. Memory & Cognition, 42(7), 1038-1048. doi.org/10.3758/s13421-014-0416-z
  2. Guerrero, T. A., & Wiley, J. (2021). Expecting to teach affects learning during study of expository texts. Journal of Educational Psychology, 113(7), 1281-1303. doi.org/10.1037/edu0000657
  3. Kobayashi, K. (2019). Learning by preparing-to-teach and teaching: A meta-analysis. Japanese Psychological Research, 61(3), 192-203. doi.org/10.1111/jpr.12221
  4. Fiorella, L., & Mayer, R. E. (2013). The relative benefits of learning by teaching and teaching expectancy. Contemporary Educational Psychology, 38(4), 281-288. doi.org/10.1016/j.cedpsych.2013.06.001
  5. Koh, A. W. L., Lee, S. C., & Lim, S. W. H. (2018). The learning benefits of teaching: A retrieval practice hypothesis. Applied Cognitive Psychology, 32(3), 401-410. doi.org/10.1002/acp.3410
  6. Kobayashi, K. (2024). Interactive learning effects of preparing to teach and teaching: A meta-analytic approach. Educational Psychology Review, 36, 26. doi.org/10.1007/s10648-024-09871-4

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