The study of history has sometimes been classified as part of the humanities and at other times as part of the social sciences.[16] It can also be seen as a bridge between those two broad areas, incorporating methodologies from both. Some individual historians strongly support one or the other classification.[17] In the 20th century, French historian Fernand Braudel revolutionized the study of history, by using such outside disciplines as economics, anthropology, and geography in the study of global history.