42 Use metadata to contextualise data and reduce the chance of misinterpretation or misuse of data. Provide guidance on how to contribute to data collection, monitoring, analysis, and reporting, e.g., to responsible authorities. Use established spatial data infrastructure (SDI), standardised approaches and terminology to increase accessibility, acceptability and openness of the results, and increase data uptake for multiple purposes and end-users. Project leaders should operate ethically and not (inadvertently) mislead participants to endorse a specific agenda. To avoid such situations, projects must operate transparently, uphold high data and project design standards, and ensure that the issue or solution they advocate for is evidence-based. B P 59 61 60 62 Behaviour Policy C Cities Citizen Science CS CS P CS P B CS P CS P