Would you advise me of the any literature regarding how interaction affects to L2 acquisition? Interaction is like not only classroom interaction but also social interaction such as social activities, religious activities, part-time jobs, and so on.
Generally speaking, L2 acquisition is highly influenced by interaction effects dominating language learning. The socio-cultural theory of L2 acquisition has demonstrated that language learning triggers a semiotic process demanding socially mediated activities which are crucial to L2 development operating within the Zone of Proximal Development (ZPD). In point of fact, learning in an L2 context
should be a collaborative process rather than an unassisted , unmediated, and isolated effort. As such, you are right to assume that such factors as social activities , religious activities, and job specifications have an important part in the interaction process. for further details, I refer you to the following links, which hopefully provide you with the targeted literature.
Acquisition or learning as stated by many theorists such as Krashen's learning hypothesis who states that learning a foreign language needs a meaningful situations in which the learners can feel relaxed as if he/ she acquires the first language.