The Self-Assessment Survey was designed specifically for Citizen Social Science projects and adapted from the self-assessment questionnaire for Citizen Science projects by Kieslinger et al. (2018). It is intended as a self-reflection tool for CSS projects and is best filled in the course of a group conversation. It triggers reflection by jointly rating a series of statements that relate to three main areas: 1) the scientific process, 2) citizens & engaged actors and 3) socio-ecological aspects. In each of these three areas, statements are rated on a Likert scale from 0 (“not at all”) to 7 (“fully”). They reflect on the perceived process of implementation as well as expected outcomes and impacts.