Hey Velony! First of all, congrats on the interview! I would try and see this as a positive thing- if they are interested in reading your dissertation then they must be keen to find out more about you. I did my MSc and PhD with the same supervisor, so she had already seen my work, but I think it's fairly common practice for them to ask for a sample of your work. It might be that they just want to find out a bit more about what you have been researching, and to see if you have good writing skills etc. I wouldn't worry too much about it- they will most likely ask you a bit about it at the interview, so if you feel that there were bits that were a bit on the weak side then it might be good to talk about what you would have done differently if you did it again etc. Research is a learning curve for everyone- we all look back and realised that we could have done it differently- so show them that you can critically analyse your own work and that you have thought about how you can improve it. That's a vital skill for any PhD student! And besides, I know fully-funded PhD students who just scraped a pass at MSc level, so a merit isn't bad going at all! Best of luck with your interview, let us know how it goes! KB