This policy analysis article critically examines the implementation of the 2018 Revitalised Agreement on the Resolution of the Conflict in the Republic of South Sudan (R-ARCSS). It employs a structured framework to assess progress against core provisions, including security sector reform, transitional justice, and constitution-making. Drawing on primary data from policy documents, monitoring reports, and institutional reviews, the analysis identifies systemic implementation challenges rooted in political economy, institutional capacity, and elite bargaining. The article concludes with evidence-based policy recommendations aimed at enhancing the agreement's sustainability and fostering a more inclusive and durable peace in South Sudan.