The nature of Web system development is significantly different from conventional software development. Good method for system development is needed. Analysis show, that main known system development methods are good at describing static web application aspects, but does not provide a good description for modeling web application behavioral characteristics. This work uses model driven approach as one, suitable for dealing with web application development problems. The key aspect of model driven approach is specifying system domain model independent of any particular technology (J2EE, Microsoft .NET, etc.) and then generating platform specific model or its implementation. The UML is user-friendly, easy to use and is useful for describing system effectively. Specification expressed in terms of UML can be rendered into an XML document using the OMG’s XMI DTD for UML, which makes UML suitable for model driven approach implementation. In this work, method for specifying application behavior design using UML was presented. This method gives rules for specifying web application behavior model, suitable for its implementation code generation. The main components used in today’s web application which implementation could be generated from the model were also described. It was shown, that it is possible to generate much of implementation, just using such a model representation in XMI. The main idea presented in this work is that web application development should be model driven as... [to full text]