This document discusses second language acquisition and universal grammar. It presents different theories on how universal grammar may apply to second language learning, including the direct accessibility hypothesis which claims that adult learners can fully access universal grammar when learning a second language. The indirect accessibility hypothesis argues that second language learners can only reset parameters based on their first language. Some challenges to applying universal grammar to second language acquisition are also outlined, such as differences between child and adult learning. The document examines various approaches to explaining second language acquisition processes.