The Subsidiary Body for Scientific and Technological Advice requested the secretariat to organize meetings of technical experts on methodological issues referred to in document FCCC/SBSTA/2011/2, paragraphs 28 and 29, including a meeting before its thirty-fifth session. A second meeting of technical experts, on forest reference emission levels and forest reference levels for implementation of REDD-plus activities, took place in Bonn, Germany, from 14 to 15 November 2011. The presentations and discussions focused on the sharing of views and experiences and the challenges faced by developing countries implementing REDD-plus activities and their efforts to construct forest reference emission levels and/or forest reference levels, lessons learned from developed countries in determining their forest reference levels for forest management and ongoing work on methodologies and approaches and their outcomes. Experts exchanged views on and addressed issues relating to the scope and purpose of reference levels, characteristics, guidance for construction and a process for communication. They highlighted several issues and elements that may need to be considered when constructing forest reference emission levels and forest reference levels and identified issues requiring further discussion