The history of ieas is a field of research in history that deals with the expression, preservation, and change of human ideas over time. The history of ideas is a sister-discipline to, or a particular approach within, intellectual history. Work in the history of ideas may involve interdisciplinary research in the history of philosophy, the history of science, or the history of literature. In Sweden, the history of ideas has been a distinct university subject since the 1930s, when Johan Nordström, a scholar of literature, was appointed professor of the new discipline at Uppsala University. Today, several universities across the world provide courses in this field, usually as part of a graduate program.