Interactive systems are increasingly interconnected across different devices and platforms. The challenge for interaction designers is to meet the requirements of consistency and continuity across these platforms to ensure the inter-usability of the system. In this paper we investigate the current challenges the designers are facing in the emerging fields of interactive systems. Through semi-structured interviews of 17 professionals working on interaction design in different domains we probed into the current methodologies and the practical challenges in their daily tasks. The identified challenges include but are not limited to: the inefficiency of using low-fi prototypes in a lab environment to test inter-usability and the challenges of "seeing the big picture" when designing a part of an interconnected system.

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We present initial results from an evaluation of a multimodal interface for a mobile route guidance application providing public transport information in Finland. The application includes a range of input and output modalities, such as speech input and output, a fisheye GUI, and contextual predictive text input. The application has been in public pilot use for almost a year. In this paper we present results from a formal user evaluation, focusing on predictive text input and speech input and output. Speech input outperformed other input methods, even with high error rates and slow response times. However, the domain specific predictive text input was the preferred method, surpassing users' expectations.

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