There are new challenges to us, as researchers, on how to design and evaluate new mobile applications because they give users access to powerful computing devices through small interfaces, which typically have limited input facilities. One way of overcoming these shortcomings is to utilize the possibilities of multimodality. We report in this paper how we designed, developed, and evaluated a multimodal mobile application through a combination of laboratory and field studies. This is the first time, as far as we know, that a multimodal application has been developed in such a way. We did this so that we would understand more about where and when users envisioned using different modes of interaction and what problems they may encounter when using an application in context. Categories and Subject Descriptors H.5 Information Interfaces and Presentation (I.7); H5.2 User Interfaces: User-centered design. General Terms Design, Experimentation, Human Factors and Theory. Keywords Action Scenar...