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This paper elaborates on previous research into the design and use of mobile information systems for supporting the use of public transportation. Contributing to this domain of HCI research, we describe the design and evaluation of a mobile travel planner, Buster, for the public city bus system of a large regional city in Denmark. Carrying on from on earlier research activities, we did contextual interviews, acting out of future scenarios in situ, and iterative paper prototyping to extend on previous design ideas and explore further the principle of indexicality in interface design for context-aware mobile systems. We then implemented a functional prototype application and evaluated it in the field.

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