Prestopnik, NathanCrowston, Kevin2023-06-082023-06-082012https://dl.eusset.eu/handle/20.500.12015/4915Citizen science is a form of social computation where members of the public are recruited to contribute to scientific investigations. Citizen-science projects often use web-based systems to support collaborative scientific activities, making them a form of computer-supported cooperative work. However, finding ways to attract participants and confirm the veracity of the data they produce are key issues in making such systems successful. We describe a series of web-based tools and games currently under development to support taxonomic classification of organisms in photographs collected by citizen-science projects. In the design science tradition, the systems are purpose-built to test hypotheses about participant motivation and techniques for ensuring data quality. Findings from preliminary evaluation and the design process itself are discussed.ensocio-computational systemsdata qualitypurposeful gaming motivationcitizen-scienceengagement10.1145/2389176.2389188