 One role for experiments in moral philosophy, as indicated above, is to investigate our moral intuitions about cases, and to use the results gleaned from such investigations to guide or constrain our moral metaphysics, semantics, or epistemology. Philosophers often rely on such judgments—in the form of claims to the effect that “we would judge x” or, “intuitively, x”—as data or evidence for a theory (though see Cappelen 2012, Deutsch 2016, and Machery 2017 for critical discussion of this point). Claims about what we would judge or about the intuitive response to a case are empirically testable, and one project in experimental moral philosophy (perhaps the dominant original project) has been to test such claims via an investigation of our intuitions and related moral judgments. In doing so, experimental moral philosophers can accomplish one of two things: first, they can test the claims of traditional philosophers about what is or is not intuitive; second, they can investigate the sources of our intuitions and judgments. These tasks can be undertaken as part of a positive program, which uses our intuitions and judgments as inputs and constructs theories that accommodate and explain them. Alternatively, these tasks can figure in a negative program, which uses experimental research to undermine traditional appeals to intuition as evidence in moral philosophy and conceptual analysis more broadly. The negative program can proceed directly or indirectly: either via testing and refuting claims about intuitions themselves, or by discrediting the sources of those intuitions by discovering that they are influenced by factors widely regarded as not evidential or unreliable. We discuss both the negative program and the positive program below.