Improvement comes from effortful work at the edge of current ability with immediate feedback, not from time served.
Ericsson's studies of violinists found the top group had accumulated far more solitary, effortful, feedback-rich practice — not more playing. He publicly disputed the fixed-hours popularisation that followed.
In practice
- A pianist who plays through pieces for an hour improves slowly; one who works four bars at tempo with a metronome and a recording improves fast.
- A salesperson who makes forty calls learns little; one who reviews three recorded calls with a coach learns a great deal.
- Possible explanations
- The explanation is that improvement requires working at the edge of current ability with immediate feedback, which is effortful and unlike ordinary repetition, so time served predicts little without it.
- In its favour
- The violin studies found a clear separation by accumulated effortful practice rather than total playing, and structured practice with feedback outperforms unstructured repetition across domains.
- Against it
- Meta-analysis finds practice explaining a substantial but limited share of performance variance, less in less structured fields such as education and professions, so the strong claim that practice accounts for nearly all of it is not supported.
- Standing
- The source of the 10,000-hour claim, which Ericsson disputed as a distortion.
- Subject
- Learning & Education
- Essay
- Theories of teaching, and what schools are for