Trenberth: The IPCC review and oversight process is very rigorous. Clearly there can be and have been some lapses, but they appear to be fairly few. I do not think the system is broken and needs further change; it simply needs more attention to adhering to the process already in place.
Christy: [IPCC] lead authors are given powerful control by being vested with final review authority and thus are able to fashion a report that supports their own opinions while marginalizing countervailing views. This is not how the real uncertainties and difficulties of climate science may be established and communicated to policymakers.
Pielke: Unless the IPCC brings its institutional policies and procedures into the twenty-first century through a wholesale institutional reform, it will continue to come out on the losing end of challenges to its legitimacy and credibility.