 The first of these has a long history in discussions of moral relativism and in fact may be considered one of the earliest instances of experimental moral philosophy. As was seen in  section 1,  for more than a century the work of anthropologists and other social scientists has contributed to the development of thought about moral relativism, both by purporting to provide empirical evidence for extensive cross-cultural disagreement and diversity about morality, and by proposing the notion that moral codes are true only relative to a culture as the best explanation of this. That is, these scientists have provided empirical grounds for accepting DMR, and they have suggested that some form of MMR is a reasonable inference from this data (though these positions were not always clearly distinguished). More importantly, the work cited in  section 1  by Brandt (1954) and Ladd (1957), involving both empirical investigations into the moral values of Native Americans and philosophical reflection on the significance of these investigations vis-à-vis moral relativism, are significant examples of moral philosophers engaging in empirical inquiry in support of philosophical aims. Their empirical work did not immediately inspire other other philosophers to engage in similar research. Experimental philosophy in this sense—experiments or other empirical investigations conducted by philosophers—did not become prominent until nearly a half-century later. Nowadays philosophers do sometimes conduct experiments to investigate the extent of moral disagreement (for example, see the study of Western and East Asian values cited in Doris and Plakias 2008). What has been much more common in recent decades has been the citation by philosophers of empirical studies by anthropologists to establish facts about moral disagreement or diversity (for example, see Prinz 2007, Velleman 2015, and Wong 1984 and 2006). There has been a renewed interest in ethics by some anthropologists in the last few years (see Klenk 2019 and Laidlaw 2017), but this has not yet attracted much attention by philosophers. There is more about these issues in  section 4.