This document summarizes the background, development, and analysis of the Transboundary Diagnostic Analysis (TDA) and Strategic Action Plan (SAP) for the Black Sea. It describes how the TDA and SAP were created with funding from GEF and other donors to address issues in the Black Sea region under the Bucharest Convention. However, it notes that both the TDA and SAP had weaknesses including limited stakeholder involvement, lack of prioritization and integration into development plans, and delays in implementation. It calls for strengthening the information basis, increasing accountability, and better tying strategies to socioeconomic realities to enhance progress on Black Sea issues.