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The earlier chapters of this book presented a conceptual understanding of awareness (Eggen and van Mensvoort, 2009, in this volume; Metaxas and Markopoulos, 2009, in this volume). A historical account (Rittenbruch and McEwan, 2009, in this volume) as well as descriptions of various implementations (see Part III) illustrate how various systems have attempted to foster greater awareness. A common challenge faced by all awareness systems is the tension with an individual’s desire for privacy (Hudson and Smith, 1996).