The objective of the assignment was to assess, compare and rate existing carbon credit rating agencies with regards to the robustness and reliability of their evaluations of carbon credit quality. Based on the findings, a summarising report of of approx. 60 pages was produced with a three-fold focus:i) A high-level comparison of the overall approach of the agencies, including the level of transparency, governance, potential of conflicts of interest cross-sectoral rating methodologies with regard to environmental integrity, co-benefits and safeguards was conducted. Inter alia, the requirements of the Carbon Credit Quality Initiative (CCQI) methodology were used as a benchmark. Based on this assessment and comparisin, a qualitiative rating of the respective approaches was provided.ii) A high-level assessment, comparison and qualititative rating of the REDD/AD rating methodologies with regard to environmental integrity was conducted. iii) Recommendations on potential improvements of existing rating agencies on the basis of the comparison were provided. Figures and tables were also included where appropriate.