With all due respect, I assume that for your dissertation, you are required to do research. It might behoove you to browse through the thousands of threads on this forum for your research. Even if a thread isn't titled as what you're looking for, there may be posts within that thread that gives you answers you are looking for. (We are not guinea pigs. 
)
http://http://www.alldeaf.com/introduce-yourself/65004-attn-those-who-wants-do-interviews-questions-surveys-please-read-first.html
