Epistemological pluralism is a term used in philosophy, economics, and virtually any field of study to refer to different ways of knowing things, different epistemological methodologies for attaining a full description of a particular field. A particular form of epistemological pluralism is dualism, for example, the separation of methods for investigating mind from those appropriate to matter (see mind–body problem). By contrast, monism is the restriction to a single approach, for example, reductionism, which asserts the study of all phenomena can be seen as finding relations to some few basic entities.