The article discusses theories of second language acquisition within the framework of nature, nurturing, and interactionist views to language learning and reveals the results of their application to non-native multilingual people’s language acquisition experiences in communicative and meaningfully absorbing environments. The research proposes the necessary space for the discussion of practicality and authenticity of nature, nurture and interactionist theories in language learning, which can be conducted as an integral examination of second language learner efficacy.