A collection of 22 interviews with researchers in 5 European countries on their data sharing practices, their motivations to share research data, what incentivises them to share research data, and their views on how data sharing can be incentivised further.. The aim of this study was to provide evidence and examples of useful incentives for data sharing from the researchers' point of view, to inform scientists and policy makers. The study involved five research teams with an established data sharing culture in partner countries of Knowledge Exchange (Finland, Denmark, Germany, United Kingdom, ...