The war in Yemen enters its fourth year: in March 2015, the Saudi-led Arab coalition started a controversial military intervention in Yemen, with the purpose to reinstate the government after a coup by insurgents in Sana’a. After years of stalemate, the conflict is still under way: nobody is winning the war, while diplomacy keeps on failing. What is the impact of the conflict on Yemen’s tribal, political, economic, and military structures? What about the future of reconstruction in the country? Beyond the short-sighted narratives based on a “Saudi-Iranian proxy war”, this ISPI Dossier aims at assessing the original drivers and domestic implications of the Yemeni crisis, identifying which dynamics will matter most in post-conflict Yemen.