Working with adult second language learners...

It is always difficult for those working with adult second language learners to apply some of the current methods to adult populations.  The difference between pedagogy and androgogy comes into play.  Therefore, it is the effective teacher or instructor who is able to synthesize the information and adapt methods and materials to adults.

Keeping in mind, also, the adult learner has many more issues with the affective filter!  Also, consider the adult second language learner to be a high school student who is being forced to learn English as well as cultural norms of American pop culture!

Here's a great article which is posted on the CAELA site:

http://www.cal.org/caela/tools/instructional/esl_methods.html