Learnability approach is the question of whether language, or some aspect of language, could, in fact, be learned by children. If language is not learnable, then it must be innate. The Learnability approach to the study of language acquisition focuses on explaining how language could be learned, in contrast to the developmental approach, which focuses on explaining the course of language development. Please see also Developmental approach.
Lexicon of Psychology - Terms, Treatments, Biographies,