According to Anthopoulos, L., & Fitsilis, P., U-city is a further extension of digital city concept because of the facility in terms of accessibility to every infrastructure.
Prema Anthopoulosu, L., & Fitsilis, P. ,U-grad predstavlja daljnje unaprjeđenje cijelog tog koncepta radi svoje mogućnosti pristupa svim vrstama infrastruktura.