The adoption of open science approaches and policies can benefit citizen science by increasing its visibility and opportunities for collaboration, ensuring data persistence, and securing its legacies and impacts in scientific research and policy. At the same time, citizen science is an approach to make research in its many facets more participatory. In light of these affinities, the Open Science working group of the [European Citizen Science Association](https://ecsa.citizen-science.net) aims to: - Explore interrelations between Citizen Science and Open Science - Foster exchange of experience and gathering of good practice at the intersections between Citizen Science and Open Science - Channel opportunities for the CS community toward engaging in regional policy processes on how Citizen Science is addressed as part of Open Science, in cooperation with policy engagement work such as [DITOs](https://ecsa.citizen-science.net/blog/introducing-doing-it-together-science-eu-citizen-science-project) - Help reduce technical, legal and other barriers that keep ECSA members and their partners from adopting open science policies and approaches that maximize the long-term impact of their programmes