[Tesis ini membahas kegagalan implementasi REDD+ Ulu Masen di Aceh pada periode 2007-2012. Kegagalan yang dimaksudkan adalah tidak berjalannya implementasi REDD+ serta tidak tercapainya target yang telah disusun. Implementasi REDD+ mengacu pada multi-level governance yang mengharuskan terjalinnya multiple linkages dari level internasional ke nasional, internasional ke sub-nasional, nasional ke sub-nasional dan vice versa. Selain itu, harus terdapat sinergitas serta koordinasi antar aktor pada masing-masing level agar tujuan kolektif yang disusun tercapai. Penelitian ini adalah penelitian kualitatif dengandesain deskriptif. Hasil penelitian menemukan bahwa kegagalan implementasi REDD+ disebabkan oleh tidak adanya multiple linkages dan adanya benturan kepentingan di antara aktor pada masing-masing level.;This thesis explains the failure of REDD+ implementation in Ulu Masen, Aceh from 2007-2012. The aforementioned failure has been characterized by the unsuccessful implementation of REDD+ framework and the failure to accomplish the designed targets. REDD+ implementation framework is identified with multilevel governance mechanism which requires multiple linkages from international to national level, international to sub-national level, national to sub-national level and vice versa. It is fundamental for each actors in every level to synergize and coordinate each actions in order to achieve the colletive purposes of designed targets. This research is conducted by qualitative method and uses descriptive design. The research discovers that the failure of REDD+ implementation is caused by the absence of multiple linkages and the conflict of interests between actors in every level., This thesis explains the failure of REDD+ implementation in Ulu Masen, Acehfrom 2007-2012. The aforementioned failure has been characterized by theunsuccessful implementation of REDD+ framework and the failure to accomplishthe designed targets. REDD+ implementation framework is identified with multilevelgovernance mechanism which requires multiple linkages from internationalto national level, international to sub-national level, national to sub-national leveland vice versa. It is fundamental for each actors in every level to synergize andcoordinate each actions in order to achieve the colletive purposes of designedtargets. This research is conducted by qualitative method and uses descriptivedesign. The research discovers that the failure of REDD+ implementation is causedby the absence of multiple linkages and the conflict of interests between actors inevery level.]