   One of the main rivals to the three-valued semantics is the Revision Theory of Truth, or RTT, independently conceived by Hans Herzberger and Anil Gupta, and first presented in publication in Herzberger 1982a and 1982b, Gupta 1982 and Belnap 1982 — the first monographs on the topic are Yaqūb 1993 and the locus classicus, Gupta &amp; Belnap 1993. The RTT is designed to model the kind of reasoning that the liar sentence leads to, within a two-valued context. (See Section 5.2 on the question of whether the RTT is genuinely two-valued.) The central idea is the idea of a revision process: a process by which we revise hypotheses about the truth-value of one or more sentences. The present article's purpose is to outline the Revision Theory of Truth. We proceed as follows: