The IMIX Demonstrator: An Information Search Assistant for the Medical Domain Abstract In the course of the IMIX project a system was developed to demonstrate how the research performed in the various subprojects could contribute to the development of practical multimodal question answering dialog systems. This chapter describes the IMIX Demonstrator, an information search assistant for described, as well as its role in the IMIX project. 1 Introduction The IMIX research programme covered four research areas: (i) Automatic speech recognition (ASR) within the context of multimodal inter- action; (ii) Dialogue management and reasoning; (iii) Information presentation in multimodal systems in natural language; (iv) Information extraction. An important aim of the IMIX Programme was to bring research from these different fields together. The building of a common demonstrator was seen as a means to this end. This chapter describes the common demonstrator. The challenge was to find an appropriate architecture which would allow the development of loosely coupled modules in such a way, that changes to one module during Dennis Hofs Roessingh Research and Development, Enschede, The Netherlands, e-mail: d.hofs@rrd.nl Boris van Schooten University of Twente, Enschede, The Netherlands, e-mail: schooten@ewi.utwente.nl Rieks op den Akker University of Twente, Enschede, The Netherlands, e-mail: infrieks@ewi.utwente.nl A. van den Bosch and G. Bouma (eds.), Interactive Multi-modal Question-Answering, © Springer-Verlag Berlin Heidelberg 2011 Theory and Applications of Natural Language Processing, DOI 10.1007/978-3-642-17525-1_2, the medical domain. The functionalities and the architecture of the system are 11 Dennis Hofs, Boris van Schooten and Rieks op den Akker