Done, I did not get the categories part though... Should it not have been items? Your survey is really very short.
![Sad](https://bitcointalk.org/Smileys/default/sad.gif)
What can you possibly get from 8 questions? {Why people use Bitcoin and not other payment methods / What do they buy / How old are they / How did they find out about Bitcoin}
Is Bitcoin the main subject of your thesis or only a sub section of a payment system? Anyway.. Good luck.
![Cool](https://bitcointalk.org/Smileys/default/cool.gif)