The TIME4CS Reflection tool for institutional changes in Citizen Science (CS) is dedicated to anyone that would like to pursue sustainable institutional changes towards Citizen Science. This tool has been developed by the European Science Foundation within TIME4CS project (grant agreement No 101006201). It draws its inspiration from the Reflection Tool for RRI initiatives designed within GRACE project, and has been adapted to the field of Citizen Science. TIME4CS Reflection Tool assists you to promote institutional changes towards Citizen Science in your organisation. TIME4CS implementing partners have found it useful for the development of their own action plan to support Institutional Changes in Citizen Science. Now it is your turn to try it! The tool will support you to define the Grounding Actions, i.e. actions aimed at implementing or favouring Institutional Changes. It will guide you to reflect on the big vision, to identify the relevant stakeholders, to define the success criteria of the actions, to highlight the necessary resources and find solutions to possible obstacles, as well as to formulate the timeline of the concrete steps needed to achieve sustainable changes. Going through this process will provide you with all the core information to feed your roadmap, i.e. the action plan for institutional changes. Get ready and embark on the journey towards institutional changes in Citizen Science!