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The use of context is important in interactive applications. It is particularly important for applications where the user's context is changing rapidly , such as in both handheld and ubiquitous computing. In order to better understand how we can use context and facilitate the building of context-aware applications, we need to more fully understand what(More)
In this paper, we describe our experiences of developing and evaluating GUIDE, an intelligent electronic tourist guide. The GUIDE system has been built to overcome many of the limitations of the traditional information and navigation tools available to city visitors. For example, group-based tours are inherently inflexible with fixed starting times and(More)
The GUIDE system has been developed to provide city visitors with a hand-held context-aware tourist guide. The system has been successfully deployed in a major tourist destination and is currently at the stage where it is publicly available to visitors who wish to explore the city. Reaching this stage has been the culmination of a number of distinct(More)
This article considers the importance of context in mobile systems. It considers a range of context-related issues and focus on location as a key issue for mobile systems. A design framework is described consisting of taxonomies of location, mobility, population, and device awareness. The design framework inorms the construction of a semantic model of space(More)
47 The GUIDE project [4, 6] has been developed to provide city visitors with up-to-date and context-aware hypermedia information while they explore the city of Lan-caster in England. Visitors view this information via a handheld GUIDE unit based on the Fujitsu TeamPad 7600 tablet PC, which measures 213x153x15mm, weighs 850g, and is powered by a Pentium(More)
D espite being written over 10 years ago, many aspects of Mark Weiser's vision of ubiquitous computing appear as futuristic today as they did in 1991. 1 The reasons for this apparent lack of progress are manifold, and other articles in this issue explore remaining technical problems in specific areas of ubiquitous computing research. We focus on the(More)
A s mobile devices and location systems such as the Global Positioning System (GPS) and phone-based technologies proliferate, so too does interest in location-based applications. These applications include tourist information systems, buddy services that inform users when a friend is nearby, and location-based advertisements , which marketers send to users(More)