This paper shows a modeling and developing methodology for mobile web applications using the MDA (Model Driver Architecture) approach. It´s based on a conservative extension of UML allowing modeling with any existing tool capable of exporting the model to XMI (XML Metadata Interchange), the standard exchange format for UML diagrams. The methodology is based on the four main activities of the hypermedia modeling: conceptual modeling, navigation modeling, abstract interface design and implementation, but it simplifies the interface and navigation modeling based on reusable components. These components will be easily automatically converted into the application source code which with the use of different templates can target different platforms and also have a front-end and back-end system on different platforms for the same application.