Assignment question: Assess the role of input in second language

Assignment question: 

Assess the role of input in second language acquisition according to at least two different learning theories covered in this module.

Choose two theories from the PowerPoint, and discuss accordingly. Kindly, include sources other than the ones in the PowerPoint. 

The PDF file, in an example of the structure of the assignment. It should be 2,500 words and no more please.