In this chapter we show how to design Web applications as shared views of conceptual models. We argue that Web applications are different from conventional applications because they include an additional design dimension: their hypermedia-like structure. We present the Object-Oriented Hypermedia Design Method (OOHDM), a state-of-the art approach for building Web Information systems. We stress navigational and user interface design as novel activities in development methods. Then, we address the problem of reusing design models; we introduce hypermedia frameworks as a conceptual tool to build and reuse generic models. We finally discuss navigation and interface patterns and we show how we use them to capture and convey design expertise.