Di Sciullo argues that the asymmetric property of morphological relations is part of the language faculty. She proposes a theory of grammar, Asymmetry Theory, according to which generic operations have specific instantiations in parallel derivations of the computational space. She posits that morphological and syntactic relations share a property, asymmetry, but diverge with respect to other properties of their primitives, operations, and interface representations. Di Sciullo offers empirical support for her theory with examples from a variety of languages, including English, Modern Greek, African, Romance, Turkish, and Slavic.