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This paper contains recommendations to writing teams of the IPCC Third Assessment Report on how to improve consistency of assessment and reporting of key uncertainties. Part I (Introduction) provides background information, including the rationale for this guidance. Part II lists the specific recommended steps—concisely in Box 1, and more fully in the text itself. Annex 1 contains examples from each of the contributions of the three IPCC Working Groups to the Second Assessment Report (SAR) to illustrate the diversity of approaches used to assess and characterize uncertainty in previous IPCC efforts. This “final” revision responds to comments received during three previous rounds of review. We use quotes around the adjective “final” to describe this published version because we know that work on guidelines such as these will never truly be completed. The chapter writing teams will undoubtedly offer additional …