This document outlines the objectives, methodology, timeline, and expected outcomes of a joint OECD CFE-DCD project on decentralized development cooperation (DDC). The project aims to provide an updated statistical analysis of trends in DDC, analyze frameworks and actors involved, identify priorities and best practices, and make recommendations. Data will be collected through surveys of DAC members, local and regional governments, case studies, and workshops. Key outputs will include an OECD publication, online database, and profiles of donor DDC. The one-year participatory process involves stakeholders from central governments, local/regional governments, and international organizations.