Eugenics includes a wide range of programmes to manage the hereditary contribution of individuals to the next general. Some approaches focused on individuals and pedigrees. Others focused on statistics and census information. Eugenics programmes always were controversial in the places and periods they were proposed. They were widely understood to be overtly and covertly discriminatory. Eugenics campaigns didn’t need science, but some deployed science to make their arguments seem stronger (and some scientists took central roles in these campaigns because they thought science would improve the campaigns). The relationship between eugenics and scientists is a subject of significant research.