How to use it
Count lands out of 10 for every new skill. Practise around 7 of 10. Perform (height, concrete, an audience) only what you land 9 of 10 in practice. A skill at 0 of 10 belongs on mats.
How sure we are
E Evidence: built from practice. What works for coaches and practitioners. Labelled that way.
Sources
theory papers on optimal error rates (Wilson et al. 2019; a 2026 motor-learning preprint) · training that encouraged errors beat error-avoiding training, especially for transfer to new tasks (Keith & Frese 2008, meta-analysis of 24 studies, d = 0.44, 🟢) · errors made in low-stakes settings help learning (Metcalfe 2017, 🟢).
Not medical, legal or financial advice.