As citizen science is a nascent field (I think the first master course in citizen science was developed quite recently), definitions might still need work. However, a lot of work has been done in this field (also briefly described in the project proposal).Regarding REINFORCE, I think that it is important for us to decide what is the boundary between research, citizen science and science communication. Allow me some thoughts on that (continuing in the next comment also): In REINFORCE, the research teams identified their needs (e.g better understand sources of transient noise in Virgo)

--> After doing a task analysis, we went through data selection, data analysis methodology, production of project template and finally production of the relevenat citizen science project. Therefore, research identified their need and developed a project in which they needed support by citizens. They required a statistically significant set of classifications, classified by more than 1 people with good consensus to produce scientific output. This is more or less the need of the research team. Citizen science here was translated as the sustained engagement of citizens with the science content

--> and the research teams in order to help produce this dataset. Therefore, the requirement there was the influx of citizens who would participate through a platform , in constant contact with researchers, learning throughout the process in order to be able to perform well in the related tasks. This is the citizen science part. However, in order to reach out to these citizens, to inform them and involve them, communciation and training activities were required. To sustain engagement, one should go beyond scientific content and focus also on dedicated empowerment activities etc.

--> The activities around, before and after the project that bring new citizens, train them, empower them etc have a big communication part within. This schematic shows the interrelation of research, citizen science, communication and education in a citizen science project based on the relevant framework developed in REINFORCE.