the establishment of systems theory... [T]he two most influential suggestions were the comprehensive sociological versions of systems theory which were proposed by Talcott Parsons since the 1950s and by Niklas Luhmann since the 1970s.Elements of systems thinking can also be seen in the work of James Clerk Maxwell, particularly control theory. General systems research and systems inquiry Many early systems theorists aimed at finding a general systems theory that could explain all systems in all fields of science. Ludwig von Bertalanffy began developing his 'general systems theory' via lectures in 1937 and then via publications from 1946. The concept received extensive focus in his 1968 book, General System Theory: Foundations, Development, Applications. There are many definitions of a general system, some properties that definitions include are: an overall goal of the system, parts of the system and relationships between these parts, and emergent properties of the interaction between the parts of the system that are not performed by any part on its own. Derek Hitchins defines a system in terms of entropy as a collection of parts and relationships between the parts where the parts of their interrelationships decrease entropy. Bertalanffy aimed to bring together under one heading the organismic science that he had observed in his work as a biologist. He wanted to use the word system for those principles that are common to systems in general. In General System Theory (1968), he wrote: In the preface to von Bertalanffy's Perspectives on General System Theory, Ervin László stated: Bertalanffy outlines systems inquiry into three major domains: philosophy, science, and technology. In his work with the Primer Group, Béla H. Bánáthy generalized the domains into four integratable domains of systemic inquiry: philosophy: the ontology, epistemology, and axiology of systems theory: a set of interrelated concepts and principles applying to all systems methodology: the set of models, strategies, methods and tools that instrumentalize systems theory and philosophy application: the application and interaction of the domains These operate in a recursive relationship, he explained; integrating 'philosophy' and 'theory' as knowledge, and 'method' and 'application' as action; systems inquiry is thus knowledgeable action. Properties of general systems General systems may be split into a hierarchy of systems, where there is less interactions between the different systems than there is the components in the system. The alternative is heterarchy where all components within the system interact with one another. Sometimes an entire system will