[…] when the parameters of UG are fixed in one of the permitted ways, a particular grammar is determined, what I will call a "core grammar". In a highly idealized picture of language acquisition, UG is taken to be a characterization of the child's pre-linguistic initial state. Experience - in part, a construct based on internal state given or already attained - serves to fix the parameters of UG, providing a core grammar, guided perhaps by a structure of preferences and implicational relations among the parameters of the core theory.
- Chomsky (1993), a pag.7