The document discusses Bley-Froman's Fundamental Difference Hypothesis regarding differences between child and adult second language acquisition. Specifically, it states that Bley-Froman believes adults' SLA is guided by general cognitive learning capacities rather than the domain-specific module that guarantees children's success in first language acquisition. Adults may reach a plateau in SLA that children do not, and adults never attain the same level of grammatical intuition as native speakers.