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Additional Resources for you to Explore
The framing of second language acquisition (SLA) has varied between a focus on learner-internal factors (such as a putative universal grammar) and social or interactionist factors (negotiation of meaning). Review the presentation slides above for an overview of some theoretical milestones, and continue your reading with the following:

MacWhinney, B. (1997). Implicit and explicit processes. Studies in Second Language Acquisition 19(2), 277-81.
Swain, M. (2000). The output hypothesis and beyond: Mediating acquisition through collaborative dialogue. In J. Lantolf (Ed.), Sociocultural theory and second language learning, 97-114. Oxford: Oxford University Press.

Now apply these ideas to designing communicative tasks that will stimulate learner-learner interactions.