Hoose any one theory of second language learning and critically discuss it. Refer to Order instructions for full topic and requests.

Choose any one theory of second language learning and critically discuss it, drawing out pedagogical implications from its claim(s).
Your essay should cover at least the following:
a. a description of its main claims
b. a critical discussion of the claims
c. your evaluation of whether the theory offers you any useful insights that you could incorporate into your teaching.
Write between 2000 2500 words.
Write down the number of words used in the assignment at the end of your essay. Do not count the list of references.
(references must be from a book or journal, no internet references)

I believe the critical period hypothesis (CPH) is a good one to focus on.