The Guidelines on transition to digital terrestrial television broadcasting (DTTB) and introduction of mobile television (MTV) are intended to provide information and recommendations on policy, regulation, technologies, network planning, customer awareness and business planning for the smooth introduction of DTTB and MTV.The transition requires decisions to be made on a large number of political, social, economic and technological issues. Therefore, it is necessary to develop a well-defined roadmap covering national strategies and key decisions. The current edition of the Guidelines is a complete review of the previous editions and is applicable to all regions. This edition has been updated with the latest ITU-R Recommendations and reports, including Recommendations regarding the five DTTB systems that are in use worldwide, the decisions taken at WRC-12 and the experience gained in the applications of the Guidelines in the ITU/BDT analogue to digital roadmap projects.