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Tourists who don’t select standard guided tours have to rely on a map or on signs to explore an unknown city on their own. They often end up looking for information about an attraction they’re at – but there’s none available. They need a guidance leading them wherever they want, giving them information about whatever they find and furthermore care for their return in time. This is the main objective of the Dynamic Tour Guide (DTG). The DTG is a mobile agent enabling a personalized spontaneous guided tour. It selects attractions, plans an individual tour, provides navigational guidance during the execution and offers environmental information. This kind of ambient intelligence is based on the analysis of all available contextual information to support the tourist in any possible way with the help of mobile devices.