Social, technological, and economic factors relevant to informed decision-making are presented to provide policymakers with an understanding of factors involved in national entry into videotex and/or teletext technologies. It is assumed that the policymaker has a basic knowledge of computers, but little or no knowledge of the videotex-related technologies is required to use this guide. Costs of implementation and use--as well as infrastructural requirements--are given wherever possible. The technologies are introduced, and principles of operation and terminology are presented, including elements involved in a public videotex service and the stages in the development of such services. Socioeconomic factors, including cost/benefits and policy options, are considered, and a comprehensive list of public videotex services worldwide is provided. Four appendices include: (1) home and business applications of videotex and teletext services; (2) videotex standards; (3) references; and (4) a glossary. (KM)