Welcome to the first in a series of three publications highlighting co-production in action. It builds on our earlier work, Guidance on co-producing a research project (1), by showing how the key principles and features identified are expressed in practice. We are responding to feedback from people who called for more information about the ‘how’ of co-producing research. In short, the message was ‘you’ve given us the theory, where’s the action?’ There are many forms that co-production can take and people with greater experience of co-producing research than us. Given this, we thought the best approach was to give the public and researchers a voice by using this set of publications as a platform for sharing examples. In our earlier work we described co-producing a research project as ‘an approach in which researchers, practitioners and the public work together, sharing power and responsibility from the start to the end of the project, including the generation of knowledge.’ We also noted that some people may want to only co-produce parts of a research project. It’s worth recapping on the key principles and features because they are referred to throughout this publication.