The aim of this chapter is to define and to measure electronic democracy. In order to achieve this purpose, first, different conceptual perspectives about the interconnection between new information and communication technologies and democratic institutions are described. Second, a definition of electronic democracy and its relationship with classical theories on representative democracy is provided. Third, with this description, an index to measure the stage of development of electronic democracy in a given political system is developed. Fourth, the index is tested in some Latin American municipalities. Finally, with the obtained results, some conclusions about the level and nature of electronic-democracy implementation in the region are described. The chapter adopts an institutional approach to understand the impact of ICTs on institutions that illustrates how difficult defining and measuring this reality can get.