Let's keep it that way. In terms of manufacturing design processes, there are three main types, DfM, DfA, and DfMA. PCI explains what they entail. Read on to find out more. DFA is the official website of the Philippine Department of Foreign Affairs. It provides information and services for passport application, authentication, consular assistance and more. DFA refers to deterministic finite automata. Deterministic refers to the uniqueness of the computation. The finite automata are deterministic FA, if the machine reads an input string one symbol at a time.