  In addition to defending a particular characterization of relations in the Categories, Aristotle also suggests a general model or paradigm for analyzing what we shall call ‘relational situations’—that is, the situations or states of affairs that explain the truth of genuinely relational statements. According to this Categories model, whenever two (or more) substances are related, this is to be explained by certain monadic properties or accidents inhering in the  relata.[2]  Thus, if Socrates is similar to Theaetetus (i.e., resembles him with  respect to some  quality),[3]  this is not to be explained by an entity to which Socrates and Theaetetus are somehow jointly attached (namely, the dyadic or two-place property, being-similar-to). On the contrary, it is to be explained by a pair of accidents, one of which inheres in Socrates and relates him to Theaetetus, and the other of which inheres in Theaetetus and relates him to  Socrates.[4]