direction(s)

1. replicate environment --  [Eliens & Bhikharie (2006)],  [Eliens et al. (2007a)]
2. blue print of region --  [Eliens et al. (2007b)],  [Eliens et al. (2008)]
3. trajectory of challenges --  [Eliens & Ruttkay (2008)],  [Eliens & Ruttkay (2009)]