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Mobile applications have a great proliferation nowadays. Their usage varies from personal applications to enterprise systems. Even though there has been proliferation, the development of mobile applications confronts some limitations and faces particular challenges. The usability is one of the main domains to attend in such systems. To improve this quality attribute we suggest incorporating to the software development process best practices from other disciplines, such as usability engineering and human-computer interaction. On the other hand, it's important to incorporate studies that assist to identify requirements of each mobile device capability to offer services in usable manner. In this paper we present a proposal to apply user oriented analysis and design, emphasizing specific practices, such as user and task analysis. Also, we present a case of study consisting in a mobile application for the iPhone device, which allows us to prove our proposal.