 In addition to distinctions involving the type of data and how directly it bears on the question, we can also distinguish among experimental applied ethics, experimental normative ethics, and experimental metaethics. The first involves the variables that influence judgments about particular practical problems, such as how a self-driving car should respond to sacrificial dilemmas (Bonnefon, Sharriff &amp; Rahwan 2016). The second involves investigations of how we ought to behave, act, and judge, as well as our intuitions about moral responsibility, character, and what constitutes a good life. The third involves debates over moral realism and antirealism. In this entry we focus on the latter two.