The reason why I chose this topic was warehouse department using A4 papers cost about 1.9 million baht per year. The person in warehouse who responsible for picking up raw material for production line will printed out the slip or document that what raw material they will use, how many that they want to use and where raw material is located. Hence, it costs a lot of money for buying A4 papers. Co-workers and I decided to use tap-let instead of papers