ACKNOWLEDGMENTS
I would like to thank the staff of ICA. I am extremely grateful to my project advisors, Mr.Richard Stridbeck and specially Mr. Martin Sköld who assisted me from the beginning to the end of the project report and gave guidance and a sense of direction to me. I am very grateful to my classmate Liwen Liang who helped me collecting the data, and grateful to a choco-bar staff in ICA who let us sit in their bar to work for the data collection for my project.