There has been a long-standing dispute in the philosophical literature about the conditions under which a behavior counts as 'intentional.' Much of the debate turns on questions about the use of certain words and phrases in ordinary language. The present paper investigates these questions empirically, using experimental techniques to investigate people's use of the relevant words and phrases. g.

Argues that we know without observation or inference at least some of what we are doing intentionally and that this possibility must be explained in terms of knowledge-how. It is a consequence of the argument that knowing how to do something cannot be identified with knowledge of a proposition.

Many hold that the differences between intentions and desires are so significant that, not only can we not identify intentions with desires simpliciter, but that intentions are irreducible to any subclass of desires. My main aim is to explain why we should reject the irreducibility thesis in both forms, thereby defending the Humean view of action explanation.