This Report to WTDC-17, in response to Resolution 9 (Participation of countries, particularly developing countries, in spectrum management) (Rev. Dubai, 2014), addresses national technical, economic and financial approaches to, and challenges of, spectrum management and spectrum monitoring, taking into consideration development trends in spectrum management, case studies on spectrum redeployment, licensing processes and best practices implemented in spectrum monitoring around the world, including consideration of new spectrum--sharing. This report has been developed through close collaboration between the ITU Radiocommunication Sector (ITU--R) and the ITU Telecommunication Development Sector (ITU-D). Such joint inter-sectoral collaboration has fulfilled the target of raising awareness of and matching the ongoing radiocommunication activities and technical studies with the special and growing needs of the developing countries. Contributions made to this report encompass case studies and system level descriptions submitted by Member States and private sector members, as well as ITU-R and ITU-D activities and publications.