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The double hermeneutic is the theory, expounded by sociologist Anthony Giddens, that everyday "lay" concepts and those from the social sciences have a two-way relationship. A common example is the idea of social class, a social-scientific category that has entered into wide use in society. The double hermeneutic is held to be a distinguishing feature of the social sciences.
Anthony Giddens (1982) argues that there is an important difference between the natural and social sciences. In the natural sciences, scientists try to understand and theorise about the way the natural world is structured. The understanding is one-way; that is, while we need to understand the actions of minerals or chemicals, chemicals and minerals don’t seek to develop an understanding of us. He refers to this as the ‘single hermeneutic’. (Hermeneutic means interpretation or understanding.) In contrast, the social sciences are engaged in the ‘double hermeneutic’. The various social sciences study people and society, although the way they do so is different. Some social sciences such as sociology don’t just study what people do, they also study how people understand their world, and how that understanding shapes their practice. Because people can think, make choices, and use new information to revise their understandings (and hence their practice), they can use the knowledge and insights of social science to change their practice.
In outlining his notion of the ‘double hermeneutic’, Giddens (1984: 20) explains that while philosophers and social scientists have often considered the way “in which lay concepts obstinately intrude into the technical discourse of social science,” ... “(f)ew have considered the matter the other way around.” He explains that “the concepts of the social sciences are not produced about an independently constituted subject-matter, which continues regardless of what these concepts are. The ‘findings’ of the social sciences very often enter constitutively into the world they describe.”