System

A system is an assemblage of inter-related elements comprising a unified whole. From the Latin and Greek, the term "system" meant to combine, to set up, to place together. A system typically consists of components (or elements) which are connected together in order to facilitate the flow of information, matter or energy. The term is often used to describe a set of entities which interact, and for which a mathematical model can often be constructed.

Background

Depending on the type of system, a system can often be distinguished from individual machines, elements or processes of that system by the number, arrangements and complexity of those elements. For example, a pulley is a machine, but an elevator, which incorporates pulleys (amongst other components), is a system. Going to the doctor is a process, but health care is a system.

In the natural world, we say that there are systems. For example, the solar system of nine planets orbiting the sun. In the human body, we refer to such systems as the nervous system, the circulatory system, the digestive system, the reproductive system, and the respiratory system.

In addition, all so-called "things" are actually systems. For example, a cup is a thing, but it is also a system for holding hot or cold liquid, or other material. The cup has a certain shape and a handle, it is made of non-porous material and so on, and it is put together in such a way as to provide a useful function. Describing this thing makes up information, and defines a system.

Types of systems

An open system can be influenced by events outside of the declared boundaries of a system. A closed system is self-contained: outside events can have no influence upon the system. In practice many things are a mixture of the two. For example a prison is a closed system because the prisoners can't get out, and the wardens spend most of their time at the prison. However it is also an open system, because it depends on outside factors and the prisoners and wardens do go outside. Dynamic systems have components or flows or both, that change over time.

Systems in information and computer sciences

In computer science and information science, system could also be a method or an algorithm. Again, an example will illustrate: There are systems of counting, as with Roman numerals , and various systems for filing papers, or catalogues, and various library systems, of which the Dewey Decimal System is an example. This still fits with the definition of components which are connected together (in this case in order to facilitate the flow of information).

Systems in operations research and management science

In operations research and organizational development (OD), organizations are viewed as human systems comprised of interacting components such as sub-systems, processes and organizational structures. Organizational development theorist Peter Senge developed the notion of organizations as systems in his book The Fifth Discipline. Systems thinking has been identified as an important leadership competency where an individual thinks globally when acting locally. He or she takes into account the potential consequences of a decision on other parts of the organization.