Input is considered one of the most important factors in the acquisition of lexical and grammatical skills. Input has been found to interact with other factors, such as learner cognitive skills and the circumstances where language is heard. Language learning itself has sometimes been found to enhance cognitive skills. Indeed, intensive contact…

The critical importance of second language (L2) input, output, and interaction in TESOL notwithstanding, the decision between immersive (L2-English only) versus nonimmersive approaches is considered "the most fundamental question facing second language acquisition (SLA) researchers, language teachers, and policymakers" (Macaro, 2014, p.…