TIME4CS (Supporting sustainable Institutional Changes to promote Citizen Science in Science and Technology) aims at supporting and facilitating the implementation of sustainable Institutional Changes in Research Performing Organizations (RPOs) to promote Public Engagement (citizens and citizens associations) and Citizen Science in science and technology. TIME4CS has identified 4 Intervention Areas (IAs) that alone or combined can stimulate the Institutional Changes necessary to promote Public Engagement in R&I activities: i) Research; Education and Awareness; iii) Support resources and Infrastructure; iv) Policy and Assessment. Institutional Changes should be: i) irreversible, ii) comprehensive, iii) inclusive and iv) contextualized. Bearing this in mind, TIME4CS will establish a knowledge transfer and mutual learning programme between Front-Runners (FRs) and Implementers (Is). The first ones are RPOs with a comprehensive expertise in Citizen Science and that have already undergone Institutional Changes. The latter are TIME4CS beneficiaries still in the early stages of the implementation of Institutional Changes to support Citizen Science, willing to face the challenge of introducing CS activities in their structures. The mutual learning programme will lead to the development of specific and tailored roadmaps for each implementing organisation inclyding a set of specific and detailed actions to follow (Grounding Actions). The whole process will be supported by two facilitator partners supporting the knowledge transfer and the definition of the Grounding Actions. TIME4CS will be carried out by a consortium integrating 11 partners from 8 EU Member States and 1 associated country. TIME4CS Consortium merges a variety of complementary expertise, and the proven partners’ skills, the experiences identified and their involvement in similar initiatives are strategic for matching TIME4CS objectives.