Migration of Legacy Systems to the Web is one of the main concerns of enterprises looking for more flexible distributed application environments. This migration process comprises the construction of a Web Interface that needs to interact in an arbitrary complex manner with pre-existent business logic modules, which must pay off prior investments. These Web Engineering concerns have been already addressed with UML, although existing proposals tend to focus on the solution space. In this article we argue that new abstractions are needed for UML to capture navigation, presentation and interaction features, particular to the Web Interface idiosyncrasy, from a conceptual point of view. Our proposal, known as OO-H Method, provides a UML extension that, departing from a UML class diagram, defines a new set of views to capture