The main question that I am researching is:
Do ?sheltered programs? like ESL help Hispanic immigrant students to
be successful in their schooling or do these programs actually hinder
them (since they are getting more basic lesson plans and are
surrounded by classmates that speak their native language)?

And the other one which relates to the first question is:
How does the learning experience of these immigrant students compare
to an American exchange student who chooses to go abroad with a
program to study a second language in another country (thus being the
only English speaker in the classroom)?
Thank you.