It is often said that the citizen sciences shift the boundaries between professionals, experts, amateurs and lay people. To understand, confirm or contradict this statement, we must know what it means to be a “professional”, “expert”, “amateur” orlayman” in science.  A first step could be a look into the history of the emergence, transformation and power of social roles in science. The following literature shows how heterogeneous the roles were conceptualized in the past. What can we learn from it for today’s discourse about the citizen sciences?

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