  The discussion of Mohist epistemology presented so far has been based on an interpretation of the conception of knowledge implicit in the Mohists’ remarks in a variety of contexts. Since, unlike the Mohist Canons, early Mohist texts do not treat the concept of knowledge explicitly, this interpretation is necessarily conjectural and incomplete. When we turn to the issue of justifying claims to knowledge, on the other hand, we are on firmer ground, for the Mohists present an explicit, though sketchy, theory based on the concept of  fa (models, standards).  In outline, the theory is this. To make a judgment is to distinguish what is “this” or “right” (shi, or “shr”) in some context from what is “not” or “wrong” (fei, “fey”). The process of evaluating whether some statement or action is correct is thus one of evaluating whether the distinction on which it is based is has been drawn properly. To guide us in getting the distinctions right, the Mohists propose that we should establish fa as standards or criteria: What matches the fa is “this,” and thus correct; what doesn’t is “not.” The fa can thus be applied to justify or check knowledge claims. Conformity to the fa provides good grounds for accepting a claim, non-conformity for rejecting it. 