How can companies and citizens work together to develop innovations? How can they capture and consider each other' s needs and requirements for new technologies? The Co-Creation Toolkit uses the experience gained in 19 industry-citizen workshops in the LIV_IN project and provides general recommendations for involving users in a commercial Research & Development-Project. It is addressed to all those who are interested in involving laypersons in order to jointly design products and services in a more customer-friendly way and in the sense of RRI. The toolkit offers a lot of practical and methodological knowledge.