This depends on the project and its nature. In some projects (e.g ecology oriented projects) we can have examples of "extreme" citizen science where citizens participate in the whole process (from design of research to analysis of results). In citizen science projects related to Large Research Infrastructures, we have shown (and seen from the past) that it can have a contributory nature (doing classifications) and maybe also go one step further to co-created which is hindered by the knowledge gap and the way modern collaborations design their research.