Interdisciplinarity is an analytically reflective study of the methodological, theoretical, and institutional implications of implementing interdisciplinary approaches to teaching and research. Interdisciplinary approaches in the social sciences began in the 1920s. At a minimum, they involve the application of insights and perspectives from more than one conventional discipline to the understanding of social phenomena. The formal concept of interdisciplinarity entered the literature in the early 1970s. The scholars responsible all shared the thought that the scientific enterprise had become less effective due to disciplinary fragmentation and that a countermovement for the unification of knowledge was the proper response. However, not all interdisciplinarians believe that the unification of existing knowledge is the answer.
There are many ways of differentiating between types of interdisciplinary approaches. One classification distinguishes between multidisciplinary, crossdisciplinary, and transdisciplinary approaches. Multidisciplinary approaches involve the simple act of juxtaposing parts of several conventional disciplines in an effort to get a broader understanding of some common theme or problem. Crossdisciplinary approaches involve real interaction across the conventional disciplines, though the extent of communication; thus, combination, synthesis, or integration of concepts and/or methods vary considerably. Transdisciplinary approaches, meanwhile, involve articulated conceptual frameworks that seek to transcend the more limited world views of the specialized conventional disciplines. Even though many believe that interdisciplinary efforts can create innovative knowledge, the power structure of the disciplinary academy resists interdisciplinary inroads on its authority and resources.