In the past, if there is a change in system features or technologies, it will be difficult to change because in the old model, the design phase, an implementation and tests will be carried out on an ongoing basis and customers can only see the finished product. So if customers want to change some features or change some of the details, it will be very difficult. In eXtreme Programming is different, the stages are divided into smaller pieces and was repeated several times, and after each iteration will be a release to customers. So if there is any change in requirements or functionality will also easy to fix. Build short and short release will help customers understand the progress and results of the software, as well as help programer can easily be changed according to customer needs
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