At first glance it seems that a locomotion interface based on walking-in-place (WIP) should be easy to develop and natural to use. The current case study will show that this is not necessarily so. The case examines WIP systems that were developed and used at University College London (UCL, Mel Slater, principal investigator) and the University of North Carolina at Chapel Hill (UNC, Fred Brooks and Mary Whitton, principal investigators) during the 1994–2006 period. These interfaces were used in studies reported by Razzaque et al. (2002), Slater et al. (1995), Usoh et al. (1999), and Whitton et al. (2005). The essential characteristics of a WIP locomotion interface follow
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