Systems theory is the transdisciplinary study of systems, i.e. cohesive groups of interrelated, interdependent components that can be natural or artificial. Every system has causal boundaries, is influenced by its context, defined by its structure, function and role, and expressed through its relations with other systems. A system is "more than the sum of its parts" when it expresses synergy or emergent behavior.
Karl Ludwig von Bertalanffy was an Austrian biologist known as one of the founders of general systems theory (GST). This is an interdisciplinary practice that describes systems with interacting components, applicable to biology, cybernetics and other fields. Bertalanffy proposed that the classical laws of thermodynamics might be applied to closed systems, but not necessarily to "open systems" such as living things. His mathematical model of an organism's growth over time, published in 1934, is still in use today.
William Ross Ashby was an English psychiatrist and a pioneer in cybernetics, the study of the science of communications and automatic control systems in both machines and living things. His first name was not used: he was known as Ross Ashby.
In the context of systems science and systems philosophy, systemics is an initiative to study systems. It is an attempt at developing logical, mathematical, engineering and philosophical paradigms and frameworks in which physical, technological, biological, social, cognitive and metaphysical systems can be studied and modeled.
Generative science is an area of research that explores the natural world and its complex behaviours. It explores ways "to generate apparently unanticipated and infinite behaviour based on deterministic and finite rules and parameters reproducing or resembling the behavior of natural and social phenomena". By modelling such interactions, it can suggest that properties exist in the system that had not been noticed in the real world situation. An example field of study is how unintended consequences arise in social processes.
Charles West Churchman was an American philosopher and systems scientist, who was Professor at the School of Business Administration and Professor of Peace and Conflict Studies at the University of California, Berkeley. He was internationally known for his pioneering work in operations research, system analysis and ethics.
Systems philosophy is a discipline aimed at constructing a new philosophy by using systems concepts. The discipline was first described by Ervin Laszlo in his 1972 book Introduction to Systems Philosophy: Toward a New Paradigm of Contemporary Thought. It has been described as the "reorientation of thought and world view ensuing from the introduction of "systems" as a new scientific paradigm".
The unity of science is a thesis in philosophy of science that says that all the sciences form a unified whole. The variants of the thesis can be classified as ontological and/or as epistemic/pragmatic. There are also philosophers who emphasize the disunity of science, which does not necessarily imply that there could be no unity in some sense but does emphasize pluralism in the ontology and/or practice of science.
Equifinality is the principle that in open systems a given end state can be reached by many potential means. The term and concept is due to the German Hans Driesch, the developmental biologist, later applied by the Austrian Ludwig von Bertalanffy, the founder of general systems theory, and by William T. Powers, the founder of perceptual control theory. Driesch and von Bertalanffy prefer this term, in contrast to "goal", in describing complex systems' similar or convergent behavior. Powers simply emphasised the flexibility of response, since it emphasizes that the same end state may be achieved via many different paths or trajectories.
A system is a group of interacting or interrelated elements that act according to a set of rules to form a unified whole. A system, surrounded and influenced by its environment, is described by its boundaries, structure and purpose and is expressed in its functioning. Systems are the subjects of study of systems theory and other systems sciences.
Debora Hammond is an American historian of science, former Provost and Professor Emerita of Interdisciplinary Studies of the Hutchins School of Liberal Studies at the Sonoma State University. She is known as author of the 2003 book The Science of Synthesis: Exploring the Social Implications of General Systems Theory, and as 2005–06 President of International Society for the Systems Sciences.
The International Society for the Systems Sciences (ISSS) is a worldwide organization for systems sciences. The overall purpose of the ISSS is:
to promote the development of conceptual frameworks based on general system theory, as well as their implementation in practice. It further seeks to encourage research and facilitate communication between and among scientists and professionals from various disciplines and professions at local, regional, national, and international levels.
Systems psychology is a branch of both theoretical psychology and applied psychology that studies human behaviour and experience as complex systems. It is inspired by systems theory and systems thinking, and based on the theoretical work of Roger Barker, Gregory Bateson, Humberto Maturana and others. Groups and individuals are considered as systems in homeostasis. Alternative terms here are "systemic psychology", "systems behavior", and "systems-based psychology".
The Dutch Systems Group, or Netherlands Society for Systems Research or Systeemgroep Nederland, is a society in the Netherlands for systems theory, and its applications. Systems theoretical problems the society focuses on are, for example evolution, innovation, selection, variation, translation, participation and methodological innovation.
Cybernetics is a field of systems theory that studies circular causal systems whose outputs are also inputs, such as feedback systems. It is concerned with the general principles of circular causal processes, including in ecological, technological, biological, cognitive and social systems and also in the context of practical activities such as designing, learning, and managing.
Alexander Laszlo (*1964) is a polycultural systems scientist, currently residing in Argentina.
The viable systems approach (VSA) is a systems theory in which the observed entities and their environment are interpreted through a systemic viewpoint, starting with the analysis of fundamental elements and finally considering more complex related systems. The assumption is that each entity/system is related to other systems, placed at higher level of observation, called supra-systems, whose traits can be detected in their own subsystems.
Roy Richard Grinker Sr. was an American neurologist and psychiatrist, Professor of Psychiatry at University of Chicago, and pioneer in American psychiatry and psychosomatics.
Thaddeus Eugene Weckowicz was a Polish-Canadian social scientist, Professor Emeritus of Psychiatry, Psychology, and Theoretical Psychology at the University of Alberta, and Research Associate, Center for Systems Research, University of Alberta, known for his research in chronic schizophrenics since the 1950s.
