Many studies have already shown the advantages of building multi-modal systems. In this case study we have shown the advantages of combining natural language and a graphical interface in the interactive TV domain. In this paper we describe a multimodal dialogue TV program guide system that is a research prototype built for the case study by adding speech interaction to an already existing TV program guide. Study results indicate positive attitudes towards providing two input modes - spoken natural language input and direct manipulation by means of remote control. © Springer-Verlag Berlin Heidelberg 2003.