  The contributions of everyday individuals to significant research has grown
dramatically beyond the early days of classical birdwatching and endeavors of
amateurs of the 19th century. Now people who are casually interested in science
can participate directly in research covering diverse scientific fields.
Regarding astronomy, volunteers, either as individuals or as networks of
people, are involved in a variety of types of studies. Citizen Science is
intuitive, engaging, yet necessarily robust in its adoption of sci-entific
principles and methods. Herein, we discuss Citizen Science, focusing on fully
participatory projects such as Zooniverse (by several of the au-thors CL, AS,
LF, SB), with mention of other programs. In particular, we make the case that
citizen science (CS) can be an important aspect of the scientific data analysis
pipelines provided to scientists by observatories.
