wayward causal chain a causal chain, referred to in a proposed causal analysis of a key concept, that goes awry. Causal analyses have been proposed for key concepts – e.g., reference, action, explanation, knowledge, artwork. There are two main cases of wayward (or deviant) causal chains that defeat a causal analysis: (1) those in which the prescribed causal route is followed, but the expected event does not occur; and (2) those in which the expected event occurs, but the prescribed causal route is not followed. Consider action. One proposed analysis is that a person’s doing something is an action if and only if what he does is caused by his beliefs and desires. The possibility of wayward causal chains defeats this analysis. For case (1), suppose, while climbing, John finds he is supporting another man on a rope. John wants to rid himself of this danger, and he believes that he can do so by loosening his grip. His belief and desire unnerve him, causing him to loosen his hold. The prescribed causal route was followed, but the ensuing event, his grip loosening, is not an action. For case (2), suppose Harry wants to kill his rich uncle, and he believes that he can find him at home. His beliefs and desires so agitate him that he drives recklessly. He hits and kills a pedestrian, who, by chance, is his uncle. The killing occurs, but without following the prescribed causal route; the killing was an accidental consequence of what Harry did. See also ACTION THEORY. M.B.