This second part of the trilogy about science, focus on the various fields studying science studies (“science studies”, “metasciences” or “sciences of science”). Section 4 focus on the major fields (philosophy of science, history of science and sociology of science) but it also includes the minor fields scientometrics, psychology of science, information science, terminology studies and genre studies. Section 5 is about the fields of scholarly communication and knowledge organization. The main idea is that all the presented fields are important allies to information science with knowledge organization, and that information science should understand itself as a kind of science studies.