Abstract
In this paper, I claim “Knowing-how is a species of abilities.” This means “Ascription of the determinate knowing-how entails ascription of the determinate abilities.” For the purpose of defending this claim, I show that the case of “pianist without arms” is not counterexample of it. In addition to that, I show benefit of counterfactual analysis by pointing some criterion of determination, ascription of knowing-how. Counterfactual analysis can provide the ways which explain some ordinary intuition about knowing-how ascription.
