The aim of the paper is to recast main notions of Tadeusz Kotarbiński’s praxeolology in terms of Donald Davidson’s theory of action. The paper focuses also on ontological commitments of both theories. Though Kotarbiński did not admit events in his reistic ontology, in his praxeology conceived actions as compounded entities without any clue how to reduce the parts of action into things. I argue that Kotarbiński’s restrictive ontological reism cannot be maintained in case of praxeology, and propose to admit events as existing objects. This enables to simplify extremely complicated net of Kotarbiński’s concepts and to find the counterparts of the parts of action in Kotarbiński’s sense in Davidson’s theory of action.