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158. We will strengthen data and statistical capacities at national, subnational and local levels to effectively monitor progress achieved in the implementation of sustainable urban development policies and strategies, and to inform decision-making and appropriate reviews. Data collection procedures for the implementation of follow-up to and review of the New Urban Agenda should primarily be based on official national, subnational and local data sources and other sources as appropriate, and be open, transparent and consistent with the purpose of respecting privacy rights and all human rights obligations and commitments. Progress towards a global people-based definition of cities and human settlements may support this work.