migration policies should seek to minimize the potential negative impacts of migration on countries of origin including loss of human capital and separation of families and to maximize the potential benefits by reducing the transfer costs of remittances promoting the recognition of skills and credentials ensuring the portability of earned benefits and supporting the engagement of diaspora groups and communities in their countries of origin the development of standardized definitions and categories for the delimitation of cities and urban agglomerations is needed to facilitate the effective review and evaluation of progress in achieving the sustainable development goals and targets related to sustainable urbanization where necessary standardized concepts and definitions should be developed on topics such as internal and international migration shortterm mobility and circular and return migration concerted efforts are required to accelerate the development of methodologies to measure migrationrelated indicators of sustainable development and to generate data on key development targets that are disaggregated by migratory status