|Mobile phone brands that exist in Indonesia, indirectly force employers to purchase mobile phones to be able to compete in the world market to meet the needs of the market demanded. The purpose of this study is the purpose of this study is to create information systems tailored to the needs in order to provide the accuracy, speed and the smooth running of buying or selling. Writing method in this case is using waterfall method. Where the waterfall method is a method of development of information systems in every stage of this method be gradual and sustained. The stages of this method include the analysis, design, coding, and last is the testing stage. The results of this study in the form of information system built using Visual Studio 2008, the database using MYSQL and Crystal Report for tools to make a report on the application.
Keyword : Information Systems, Purchasing, Sales, Waterfall