Digital citizen science platforms are prominent examples of modern volunteerism that provide people with opportunities to observe natural phenomena and to engage in scientific processes. In this study, we explore the values and motivations underlying sustained participation in digital citizen science projects through the lenses of two social psychology theories (Schwartz's Human Values Theory and Self-Determination Theory). We present in-depth analyses of interviews with 15 long-term volunteers in two digital citizen science initiatives (Järviwiki and Safecast) that have been collecting environmental data for a decade in Finland and Japan. Our results advance the understanding of the values underpinning motivations. Our analyses show that openness-to-change values, such as self-direction, are important for initial participation, yet a diverse range of values, except for power, play a role in sustaining participation. Our study also shows that the values related to sustained participation are linked with extrinsic motivations, suggesting that when extrinsic motivators are self-directed, people will not only perform tasks willingly and enthusiastically but also in a sustained manner. Conceptualizing the behavioral continuum that drives volunteering actions provides practical insights that can assist the design, development, and evaluation of digital citizen science platforms.

Participation is key to building an equitable, realistic and democratic future. Yet a lack of agency in decision making and agenda-setting is a growing phenomenon in the design of digital public services. We call this pseudo-participation by and in design. The configuration of digital artifacts and/or processes can provide an illusion of participation but lack supportive processes and affordances to allow meaningful participation to happen. This exploratory paper examines the realm of pseudo-participation in the design of public digital services through two concepts: 1) pseudo-participation by design, digital interfaces, and tools that provide the illusion of participation to the people, 2) pseudo-participation in design, processes in which those affected by the design decisions are marginalized and not given any agency. We contribute to the re-imagination of participatory design in modern societies where the role of politics has become ubiquitous and is yet to be critically scrutinized by designers. CCS CONCEPTS • Applied computing → E-government; • Human-centered computing → Interaction design process and methods.

SENSEI is a community initiative involving locals, researchers, community organisations and decision makers aiming to understand the challenges they all care about. The initiative has shown how technology and participatory practices can be combined to address issues of shared concern, make sense of data and solve problems collectively.

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