The practice of science communication is fundamentally changing. This requires science communication practitioners to continuously adapt their practice to an ever-changing ecosystem and highlights the importance of reflective practice for science communication. In this study, we supported 21 science communication practitioners in developing a reflective practice. Our study shows that reflective practice enabled practitioners in becoming aware of their own stance towards science or assumptions regarding audiences (single-loop learning), underlying and sometimes conflicting values or worldviews present in science communication situations (double-loop learning), and facilitated practitioners to adapt their practice accordingly. Triple-loop learning, allowing practitioners to fundamentally rethink and transform their mode of science communication, was less observed. We argue that reflective practice contributes to opening-up public conversations on science — including a conversation on underlying values, worldviews, and emotions, next to communicating scientific facts.

This article contributes to reflective practice amongst scientists who engage with citizens in the digital public sphere, by exploring the scientists' experiences and underlying perspectives on their role repertoires in online science-society interactions. Semi-structured interviews were held with 26 European scientists to investigate their focus and contribution in boundary interactions, perspective on appropriate model of science communication, and activities, outputs and addressees in the digital public sphere — together comprising a role repertoire. The intended role of scientists often did not match with their deployed repertoire in online interactions with citizens. Participants were left with the feeling that the digital public sphere provides hollow interactions, devaluates scientific expertise or even represents a hostile environment. In order to capitalise on the promise of the digital public sphere for constructive interactions with a diverse public, a reflective practice is needed that aligns scientists' intended contribution to science-society interactions with the scientists' perspective and deployed online repertoires.