Here is a brief article on a massive experiment I conducted with significant results at the Loyola ELT Centre, which I headed till 31 May 2013. Please click on the link below to read the article. (The article was published in IATEFL Voices, UK)
http://origin.misc.pagesuite.com/pdfdownload/83f46f82-ee6d-471c-9e6d-bb587757fefd.pdf
http://origin.misc.pagesuite.com/pdfdownload/83f46f82-ee6d-471c-9e6d-bb587757fefd.pdf