ACKNOWLEDGMENT
	I write this paper as my final report for finishing my Master Honours of Information System. I would like to take this opportunity to say thank you to everyone that helping and give support to me while I was doing my research.      First of all, I would like to thank my brilliant supervisor, Aditya Ghose who guides me to do this research from the first semester until I finish it. Thank you for all encouragement that you gave to me.      I would like to thank Peter Harvey and Samantha for helping me solve the CSP formulation. I really appreciate it.      I thank all of my friends in Decision System Laboratory for helping me and supporting me from the first time I am in DSL.