The preparation of IPCC Assessment Reports involves several stages, three of which are designated "Expert Review", "Expert and Government Review" and "Government Review". These three stages respectively address the first order draft (FOD), the second order draft (SOD) and the near-final draft of the Summary for Policymakers.
Of particular interest to the wider scientific community is the review of the SOD of the Working Group I contribution to these assessment reports because this is the last stage at which individual reviewers can comment on the draft document.
The Working Group I contribution to the IPCC's Fifth Assessment Report (5AR) was released in late 2013 and published in hard copy form earlier this year. IPCC authors are required to respond in writing to each review comment. Both the comments and responses are now available online via the link labelled "Drafts and review Materials" on web page http://www.ipcc.ch/report/ar5/wg1/. (A web search also revealed that the files containing review comments and responses, along with other files, are available at http://www.climatechange2013.org/images/report/.)