Chapter 13. Make It Stick

Space it outCopy Anchor Link

The spacing effect — that learning spread out over time lasts longer than learning crammed together — was first documented by Hermann Ebbinghaus in 1885. Cepeda and colleagues' 2006 meta-analysis reviewed 317 experiments from 184 articles and confirmed it. A (lab page)

Pull it out, don't just look at itCopy Anchor Link

The testing effect (retrieval practice) — that recalling something strengthens memory more than reviewing it — has been replicated many times over roughly a century. A catch: spaced retrieval often makes short-term performance feel worse while improving long-term learning. A

A meta-analysis of 29 studies found no meaningful difference between expanding gaps and equal gaps between practice sessions. What matters is coming back, not the exact schedule. A (Springer)

One honest caveat: these effects are strongest for memorizing information, and direct evidence for speaking skills is still thin. We apply the principles because they're well established elsewhere, not because they've been proven for meetings. C

Short is engaging; engaging isn't learningCopy Anchor Link

A study of 6.9 million video-watching sessions on edX found that shorter videos were much more engaging, and recommended keeping them under six minutes. The authors also noted that engagement is necessary but not sufficient for learning. B (Guo, Kim & Rubin 2014)

Short lessons get you to watch. To get better, you have to do something afterward.

How to use Kairu's lessonsCopy Anchor Link

1. One move at a time. Each lesson teaches one move in one moment, with two or three phrases.
2. Say it before you see it. When a lesson asks you to pause and try the sentence yourself, do it out loud. That's retrieval.
3. Come back. The same move reappears in different moments — the standup, the design review, the interview. That's spacing.
4. Mix it up. Every few weeks, review lessons in random order: "How would you fix this sentence?"

Nerves: what works and what's overhypedCopy Anchor Link

In 2014, Alison Wood Brooks reported that people who reframed pre-performance anxiety as excitement — even just by saying "I am excited" out loud — felt more excited and performed better at singing, public speaking and math than people who tried to calm down. B (PubMed)

A direct replication published in 2025 reproduced the self-reported part almost exactly: people felt more excited. But it found no difference in observer-rated performance. Even in the original study, the "excited" group felt more excited but not less anxious. Bthe performance effect did not replicate (replication)

So: calling your nerves "excitement" may change how you feel. It's unlikely to change how you perform.

What has better support is exposure. Prolonged practice reduced speaking anxiety in early training studies, video feedback didn't increase anxiety (Chapter 12), and a structured speech training program — tested with schoolchildren — improved both organization and speech anxiety. B

The prepared first sentenceCopy Anchor Link

Put Chapters 4, 8 and 13 together and one tool stands out: a first sentence you've prepared in advance.

• It wins the floor within the 200-millisecond window (Chapter 4).
• It removes the moment when anxiety peaks: deciding how to start (Chapter 8).
• Every time you use it, you build exposure (this chapter).

Before your next meeting, write one sentence you'll say if the topic you care about comes up. Before your next 1:1, write your opening. Before your next interview, write the headline of each story. A prepared first sentence is the smallest practice unit in this book — and the one most likely to change what happens next week.

That is kairos in practice: you can't control when the moment comes, but you can be ready when it does.