This is the website of the leading research unit (SNS) of the PRO3 project "Understanding Public Data: Experts, Decisions, Epistemic Values". This project – promoted by IMT, IUSS, and SNS – intends to explore the scaffoldings of the epistemological framework, which underlies public decision-making when confronted with complex scientific data. The methodological assumption underlying the project is that the tools provided by logic, epistemology, philosophy of science, and critical reasoning can make a substantial contribution to a number of pressing issues.