The 2025 Peacebuilding Fund (PBF) Thematic Review on Youth, Peace and  Security (YPS), commissioned by the Peacebuilding Support Office (PBSO)  in partnership with UNFPA, UNICEF and Climate Security Mechanism, and  led by the UN University’s Centre for Policy Research, outlines  programmatic best practices and lessons learned on youth participation  in peacebuilding, drawing on examples from 41 PBF-funded projects  spanning 33 countries and territories between 2018-2022.