Systems theory is the interdisciplinary study of systems in general, with the goal of elucidating principles that can be applied to all types of systems at all nesting levels in all fields of research.[citation needed] The term does not yet have a well-established, precise meaning, but systems theory can reasonably be considered a specialization of systems thinking, a generalization of systems science, a systems approach. The term originates from Bertalanffy's General System Theory (GST) and is used in later efforts in other fields, such as the action theory of Talcott Parsons and the system-theory of Niklas Luhmann.
In this context the word systems is used to refer specifically to self-regulating systems, i.e. that are self-correcting through feedback. Self-regulating systems are found in nature, including the physiological systems of our body, in local and global ecosystems, and in climate—and in human learning processes.
Contemporary ideas from systems theory have grown with diversified areas, exemplified by the work of Béla H. Bánáthy, ecological systems with Howard T. Odum, Eugene Odum and Fritjof Capra, organizational theory and management with individuals such as Peter Senge, interdisciplinary study with areas like Human Resource Development from the work of Richard A. Swanson, and insights from educators such as Debora Hammond and Alfonso Montuori. As a transdisciplinary, interdisciplinary and multiperspectival domain, the area brings together principles and concepts from ontology, philosophy of science, physics, computer science, biology, and engineering as well as geography, sociology, political science, psychotherapy (within family systems therapy) and economics among others. Systems theory thus serves as a bridge for interdisciplinary dialogue between autonomous areas of study as well as within the area of systems science itself.
Urie Bronfenbrenner (April 29, 1917–September 25, 2005) was a Russian American psychologist, known for developing his Ecological Systems Theory, and as a co-founder of the Head Start program in the United States for disadvantaged pre-school children.
Immanuel Maurice Wallerstein (born 28 September 1930 New York City) is a US sociologist, historical social scientist, and world-systems analyst. His bimonthly commentaries on world affairs are syndicated.
Wallerstein first became interested in world affairs as a teenager in New York City, and was particularly interested in the Indian independence movement at the time. He attended Columbia University, where he received a B.A. in 1951, an M.A. in 1954 and a PhD degree in 1959. He subsequently taught there until 1971, when he became professor of sociology at McGill University. In 1973 he was president of the African Studies Association. As of 1976, he served as distinguished professor of sociology at Binghamton University until his retirement in 1999, and as head of the Fernand Braudel Center for the Study of Economies, Historical Systems and Civilization at Binghamton University until 2005.
Wallerstein held several positions as visiting professor at universities worldwide, was awarded multiple honorary titles, intermittently served as Directeur d'études associé at the École des Hautes Études en Sciences Sociales in Paris, and was president of the International Sociological Association between 1994 and 1998.