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The construction of spaces composed of physical artefacts augmented with computational, sensing, auto-identification and wireless communication capabilities is becoming increasingly practical at larger scale and drives research interest in the technical challenges related to the everyday use of such intelligent environments. Nevertheless, several barriers remain before intelligent environments can be effectively used, notably the fact that abundance of such computational and communication capability does not necessarily imply the availability of useful or usable services and applications. In fact, the contrary is often the case since such spaces are the source and possibly also the repository of massive amounts of data created by the continuous archival of personal experiences, which users cannot access in a meaningful way. A major challenge in making intelligent environments useful is indeed the development of efficient and effective navigation mechanisms that is, the ability to search, locate and retrieve information as and when needed so as to fit the task at hand. To be sure, in addition to capture, intelligent environments must provide mechanisms for the effective navigation of recorded personal experiences as a core ingredient of their architecture.