We would like to thank several people who made this work possible for us with their continuous support and encouragement. First of all we are grateful to our thesis supervisor Associate Professor Zsuzsanna Vinzce, for her patience, advice and support during our entire thesis work. She guided and motivated us during the whole process of our research. Secondly, we would also like to thank all the respondents who participated in our survey and we believe that without them this thesis couldn t ́ be possible. We want to thank Professor Kenny Brännberg from the statistics department and Dr. Mojgan Pedyab for their assistance with our data analysis. We appreciate their time and valuable discussion which we got for the statistical assistance regard...