Science and science advice: a defining moment? explores the evolving role of science and scientists in policymaking amid societal complexity, polarization, and uncertainty. It highlights challenges in trust between society, governments, and research institutions, and considers how science advice can remain effective, inclusive, and evidence-based. The article emphasizes collective intelligence, the role of honest brokers, and the importance of iterative, context-sensitive approaches to navigating complex policy landscapes.

Strengthening the International Ecosystem for Scientific Advice examines the growing global and European efforts to build more coordinated, resilient, and inclusive science-for-policy systems. Drawing on recent initiatives by INGSA, the European Commission, and national advisory communities, the article outlines the opportunities and challenges of linking diverse advisory structures, reducing fragmentation, and enhancing institutional capacity for evidence-informed policymaking. It highlights the importance of connectivity, mutual learning, and principled approaches to scientific advice—especially in a period marked by geopolitical uncertainty, technological transformation, and complex societal challenges.

Science advice in challenging settings is an increasingly relevant issue and there is value in ‘slow conversation’ to explore the challenges and co-create paths forward. This series aims to address some of the recent challenges that emerged in conversations that have taken place through the INGSA Europe community. We invite contributions to this ‘slow conversation’ to explore more deeply how science advice can be effective today and lay evidence based foundations for the future that is being created.