Abstract
The present research investigates how the IPCC’s Working Groups safeguard their scientific character while communicating with policymakers. Due to the different nature of Working Groups’ assessments, all Working Groups make different boundary arrangements of how science is defined; what is considered as relevant knowledge; and what the division of labor is amongst Working Groups. The results show that science is a context-specific activity in a constantly changing landscape, which in turn affects the IPCC’s credibility if they keep advocating that their science is policy-neutral and never policy-prescriptive.