The Subsidiary Body for Scientific and Technological Advice (SBSTA), at its twenty-eighth session, invited Parties and relevant organizations to submit to the secretariat, by 18 September 2009, information on efforts undertaken, including methods used, to assess the costs and benefits of adaptation options, as well as their views on lessons learned, good practices, gaps and needs (FCCC/SBSTA/2008/6, para. 51). The SBSTA requested the secretariat to compile these submissions into a miscellaneous document to be made available by SBSTA 31. The secretariat has received four such submissions. In accordance with the procedure for miscellaneous documents, the two submissions received from Parties are attached and reproduced in the languages in which they were received and without formal editing. In line with established practice, the submissions from two non-governmental organizations have been posted on the UNFCCC website at