In recent years, a number of authors have reported studies on the emergence and development of digital government or e-government using various criteria (Forlano, 2004; Holliday, 2002; Kaaya, 2004; Layne & Lee, 2001; Netchaeva, 2002; Reddick, 2004; Silcock, 2001; Stowers, 1999, 2004; UN, 2001, 2002, 2004). From such studies, models have been proposed which indicate two to six stages of e-government development. Some of the models place emphasis on the structural features of government agencies in relation to electronic provision of services; others place emphasis on the nature and evolution of government Web sites and corresponding services. Still, a few models consider the evolution of the use of information technology (IT) to facilitate the undertakings of government tasks. However, with the exception of the latter, the consensus emerges from the models that the development of digital government entails an evolutionary process starting with the creation of simple government Web sites for publishing information on the functions of government agencies. These simple Web sites further develop into sophisticated portal designs which correspond with the services provided, along with the levels of transactions with the users. The majority of the countries of the world are implementing e-government strategies and various assessments have categorized countries according to their stages of development based on the existing models. Apart from the brief description of the models, this chapter will also give examples of the levels of development of e-government services in different regions and countries.