  Besides its role in their epistemology, the theory of the  three fa (models)  epitomizes the Mohists’ view of logic and argumentation. The Mohists do not investigate formal logic or develop a notion of logical consequence. Rather, since they see judgment as a matter of distinguishing whether something is one kind of thing or another, they tend to conceive of all reasoning on the model of informal, analogical inference. Particular pieces of reasoning in Mohist texts may be deductive, inductive, analogical, or causal. But the Mohists themselves seem to regard all of these as different ways of applying fa to draw distinctions between similar and dissimilar kinds of things.