A synopsis of the article: This keynote article in Second Language Research presents arguments to support the idea that phonology is a computational and representational system that occupies a place in language faculty known as Universal Grammar (UG). These arguments oppose the view that phonology is merely an interface with the sensory-motor system and which the Minimalist program (Chomsky, 1995) describes as a late, spell-out process mapping morphosyntax to Phonological For