Citizen consultations are public participation mechanisms designed to inform public policy and promote public dialogue. This article describes a deliberative consultation conducted within the CONCISE project framework. The aim was to gather qualitative knowledge about the means and channels through which European citizens acquire science-related knowledge, and how these influence their opinions and perceptions with respect to four socially relevant topics: vaccines, complementary and alternative medicine, genetically modified organisms, and climate change. In 2019, the CONCISE project carried out five citizen consultations in Poland, Slovakia, Spain, Italy and Portugal to explore the understanding of nearly 500 citizens, enabling the development of a standard for the carrying out of citizen consultations on science communication.