The Federalism Filter aims to provide a mechanism for World Bank Nepal country teams to systematically support and guide the design of future projects through the lens of federalism. Its of three pillars and seven principles with recommended actions were identified through broad-based consultations with the filter's key stakeholders such as task team leaders, the Country Management Unit, operations staff, development partners and government counterparts. It was developed through a desk review of institutional and implementation arrangements in a sample of twenty four World Bank projects in six federal or decentralized countries: India, Indonesia, Mexico, Nigeria, Brazil, and Kenya. The projects were selected based on (i) the coverage of thirteen target thematic areas, (ii) being under implementation or completed, and (iii) having atleast two levels of government as beneficiaries (even if the project was implemented only by the Federal Government).