The EU-Citizen.Science project will create a platform to, among other things, raise awareness of citizen science, and facilitate anyone to engage with citizen-science projects. This document presents a list of recommendations for achieving engagement of society, including policymakers, with citizen science. Through the identification of existing projects and analysis of best practice, this report aims to establish a framework for improving engagement in existing and new projects. A list of recommendations for engagement among stakeholders is formulated based on existing literature. These recommendations are then allocated to the identified groups of stakeholders to suggest the most appropriate ways to engage different audiences.