 A primary reason is a combination of two mental states: a pro-attitude and a belief. These “primary reasons” are, in effect, explanatory reasons: reasons that explain actions. Davidson defended the “desire-belief” model of action explanation, according to which reasons are states of believing and desiring that explain actions because they cause them. This model is at the centre of Davidson’s account of intentional action, which he characterises as an event caused “in the right way” by a primary reason. Davidson’s paper was highly influential; as a result, psychologism became the dominant view for both motivating and explanatory reasons, which, as noted above, were then not explicitly distinguished.