 Characteristically, Austin suggests that the situation is more complicated. In particular, although he thinks that, in normal or standard cases, actors are responsible for what they do and act freely, he holds that what makes that so can vary from case to case: different types of machinery can account for freedom and responsibility with respect to different types of action. He holds moreover that different aggravating and excusing modifiers target different pieces of machinery. And, finally, he holds that the appropriate use of a modifier doesn’t depend only upon the presence or absence of instances of the type of action-machinery that it targets. In addition, it depends upon whether the targeted machinery figures in normal cases of actions of the type in  question.[24]