 We often speak of casuistry full-stop, and when we do we generally have in mind an approach to ethics that emphasizes analogical reasoning with concrete actual cases (the one before us, and relevantly similar past cases). When one encounters a case, one harkens back to a relevantly similar case from the past, recalls how one responded in that case, and “applies” that reasoning to the case before one. We should, however, recognize the distinction between two versions of the approach. To start, there is casuistry understood simply as the practice of addressing particular cases, treating them through the application of (abstract) principles. Understood as such, casuistry would seem to be rightly viewed as a logical complement to approaches to bioethics that take moral principles to be morally binding (Arras 2017: 46). Casuists here hold that principles can have an action-guiding or normative force that is not reducible to our responses to cases, and that the moral knowledge represented by such principles is not reducible to responses to cases (Jonsen 1995). Note that when defined in this way, differences between this moderate version of casuistry and a more traditional top-down application of moral principles to cases might be difficult to pinpoint.