The benchmark consists of three levels. Six key ‘smart’ characteristics have been identified as relevant for our investigation for smart city index (benchmark). They can be divided into 31 relevant factors that reflect the most important aspects of each intelligent characteristic evaluated. This is second and third level of our index (benchmark). An unregistered user has access to the first level, registered to the second, and on request we will prepare self-government data for the third level of the index (the most comprehensive).