Step Change, coordinated by the University of Primorska and consisting of 11 partners from 7 European countries and Uganda, is an EU-funded project aiming to explore the potential of Citizen Science. Over the next three years, the project will implement five Citizen Science Initiatives (CSIs) in the areas of energy, environment, health and infectious diseases, paying particular attention to the participatory and self-reflexive analysis and evaluation of their collaborative research processes, scientific outcomes and societal impacts. The project is funded by the H2020 programme.