Chapter 12. How Skills Change
Speaking behaviors can be taught: explain, demonstrate, practice, give feedback. But "just practice more" is oversold, and badly aimed feedback can make people worse.
Explain, show, practice, correct
Behavioral skills training (BST) has four steps: instruction, a model or demonstration, rehearsal, and feedback. In a 2022 study, remote video-based BST improved targeted presentation behaviors in all four adult participants; the gains held as audiences grew, and outside experts rated them as more effective speakers. Filler words, however, did not change. Bfour participants, single-case design (ERIC)
A separate 2024 study used awareness training — learning to notice your own fillers — and it did reduce them. But expert ratings of speaking effectiveness did not improve, and some fell. Bsmall sample
Two lessons. Structured training works on structure. And polishing the surface (fewer "ums") is not the same as communicating better.
Watching a good model works
An early comparison of public speaking training found only modest differences between "instruction plus modeling" and "video feedback plus discussion"; performance feedback outdid modeling on just one measure. B
Seeing a clear before-and-after example does a lot of the work, cheaply. That is why every Kairu lesson shows a weak version and a strong version of the same sentence.
Watching yourself works too
A meta-analysis of 12 studies on videotaped feedback in public speaking courses found that it improved speech content, skill acquisition and test scores, and did not significantly increase anxiety (Bourhis & Allen, 1998). A (abstract)
Your phone is enough. Record your 60-second answer, listen once, change one thing, record again.
The 10,000-hour myth
A 2014 meta-analysis of 88 studies (Macnamara, Hambrick & Oswald) found that the amount of deliberate practice explained about 26% of performance differences in games, 21% in music, 18% in sports, 4% in education — and less than 1% in professions. Across domains, practice explained about 12%. A (abstract)
Be precise about what this means. It measures the correlation between how much people practiced and how good they were. It does not say training is useless; the experiments above show targeted training changes behavior. And the "professions" category drew on only a few studies.
The takeaway: talking more in meetings won't automatically make you better. Pick one move, see a good example, practice it, get specific feedback. That is the logic of a one-move lesson.
Feedback can backfire
Kluger and DeNisi's 1996 meta-analysis covered 607 effect sizes. On average, feedback improved performance (d = .41) — but in more than a third of cases, it made performance worse. Feedback was least helpful when it drew attention away from the task and toward the self. A (HUJI)
That shapes how this book and Kairu give feedback:
- About the sentence, not the person. "Your main point came 14 seconds in" — not "You lack confidence."
- About behavior, not identity. Never "people from your culture do this."
- One move at a time.
If you coach others, the same rules apply.
Chapter 11. Measure
Existing tools measure prepared speeches. Meetings need measures that capture what the listener actually received — one for each HERON move.
Chapter 13. Make It Stick
Watching a lesson isn't learning it. What lasts is spaced repetition and pulling the skill out yourself. And the most practical cure for nerves is a prepared first sentence.