All IPCC reports undergo two stages of review. A First-Order Draft is reviewed by experts. Following the expert review, authors develop a Second-Order Draft based on the comments received. This draft then undergoes a second review by both governments and experts. Authors will prepare a Final Draft based on the comments received during the second review. The Final Draft is distributed to governments at the time of the final government review of the Summary for Policymakers.
The First-Order Draft of the Working Group II contribution to AR6 underwent an expert review from 18 October to 13 December 2019. The Second-Order Draft was reviewed by experts and governments from 4 December 2020 to 29 January 2021. The Final Government Distribution of the final draft of the report and Government Review of the Summary for Policymakers took place from 1 October to 26 November 2021.
- Factsheet: What is an Expert Reviewer of IPCC Reports?