  New research on moral evolution accords with the above social view of moral knowledge. Michael Tomasello (2016) makes the case that human moral norms have their origin in the phenomenon of “shared intentionality” that binds diverse individuals to a common project in which they see each other as equal partners. When moral norms conflict each person in a group that is motivated by these norms is an equal partner in the shared project of resolving the moral conflict. If morality is a shared project in this way, the cost of excluding some persons from the process of resolving moral conflict can be significant. Such exclusion can undermine achieving moral knowledge that depends on input from diverse individuals acting as equals.