Gardner's early Socio-Educational Model from 1985 views second language acquisition as a socio-psychological process influenced by cultural beliefs and individual differences. The model represents how factors like intelligence, aptitude, motivation, and anxiety influence language learning outcomes in formal and informal contexts. It was later modified in 1993 to add language learning strategies and show how motivation and anxiety play a larger role in informal language learning situations. Both models provide a basis for understanding second language acquisition as involving purposeful behavior shaped by social and psychological factors.