System

A system is a group of parts.

These parts work together. They follow rules to act as one.

Some systems are made by nature. Other systems are made by people.

Some systems are open. They take things in and send things out. A car is an open system.

Other systems are closed. They do not let things in or out. A computer is a closed system.

Some systems are isolated. They do not swap anything with the world. The whole universe might be one.

Systems are everywhere!

A system is a group of parts that work together.

These parts follow rules to act as one whole. Systems can be natural or made by people. Natural systems include the solar system or living things. Human-made systems are built for a specific purpose.

We can group systems by how they act. Most systems are open systems. They take in things like matter or power. They also send things out to the world. A car or the Earth are open systems.

Some systems are closed. They swap power with the world but not matter. A computer is a closed system. The last kind is an isolated system. These do not swap matter or power with anything else. The universe is a theoretical example of this.

A system can also have smaller parts inside it. We call these parts subsystems. A subsystem is a system itself. It is also a part of a larger system. Scientists study these parts to see how they work together.

A system is a group of parts that work together as one whole. These parts follow a set of rules to interact with each other.

Every system has a boundary that separates it from its environment. This boundary helps us decide what is inside the system and what is outside. We can also use models to represent a system. Models help us understand how a system might behave in the future.

Systems work in different ways depending on how they interact with the world. Most things we see are open systems. An open system takes in inputs and produces outputs. These inputs and outputs can be matter, energy, or even information.

For example, a car or the Earth are open systems. A closed system is a bit different. It can exchange energy with the environment, but it does not exchange matter. A computer is an example of a closed system. An isolated system is the most separate kind. It does not exchange matter or energy with anything else. Scientists use the Universe as a theoretical example of an isolated system.

People have studied systems for a long time. In the 1800s, a French physicist named Sadi Carnot studied systems in steam engines. He looked at how heat could make a substance do work. In 1850, a German physicist named Rudolf Clausius expanded this idea. He added the idea of the surroundings to the study. Later, a biologist named Ludwig von Bertalanffy became a leader in general systems theory. In 1945, he introduced laws that apply to many different kinds of systems. In the late 1940s, Norbert Wiener and Ross Ashby used math to study systems. They called this new field cybernetics.

There are many specific types of systems in our world. A subsystem is a smaller system found inside a larger one. For example, the IBM Mainframe Job Entry Subsystem is a group of parts that work together.

In computer science, an information system uses hardware and software to work. You might know the Dewey Decimal Classification used in libraries. That is a system used to organize information. There are also economic systems. These systems help societies produce and use goods and services. They include people, institutions, and rules about resources.

Systems are all around us in every part of life. Natural systems include things like galaxies, the Solar System, and living things. Human-made systems are designed for specific tasks. This includes physical structures or even ways of thinking. Even the human brain and our mental processes are seen as systems.

We can see systems in how cities grow or how people act in groups. Whether it is a tiny atom or the huge universe, everything follows these patterns. Understanding systems helps us see how the whole world is connected.

A system is a group of interacting or interrelated elements that act according to a set of rules to form a unified whole. Every system is surrounded by an environment that influences it. To understand a system, scientists define its boundaries, its structure, and its purpose. These characteristics are expressed through the system's functioning. Systems theory is the scientific study of these complex structures. By looking at systems, we can see how different parts work together to create something larger than themselves.

To study a system, researchers often create a model. A model is a simplified representation used to understand or predict how a system will behave. This process involves defining the system's boundaries. A boundary is a line that separates the entities inside the system from the environment outside. This allows scientists to decide which parts are part of the system and which are not. By using these models, we can analyze the structure and the behavior of the whole entity.

Systems are categorized by how they exchange things with their environment. Most systems are open systems. These systems have input and output flows, meaning they exchange matter, energy, or information with their surroundings. A car or the Earth are examples of open systems. A closed system is different because it exchanges energy but not matter with its environment. A computer or a project like Biosphere 2 are examples of closed systems.

Finally, an isolated system exchanges neither matter nor energy with its environment. The Universe is a theoretical example of an isolated system.

The study of systems has a rich history in science. In 1824, the French physicist Nicolas Léonard Sadi Carnot pioneered the concept while studying thermodynamics. He studied a "working substance," such as water vapor, in steam engines. He looked at how heat applied to this substance allowed it to do work. In 1850, the German physicist Rudolf Clausius expanded this by including the concept of surroundings. Later, the biologist Ludwig von Bertalanffy became a pioneer of general systems theory. In 1945, he introduced laws that applied to many different kinds of systems. In the late 1940s, Norbert Wiener and Ross Ashby used mathematics to study systems of control and communication, a field called cybernetics.

Systems can also be organized by scale through the use of subsystems. A subsystem is a set of elements that is a system itself, but also acts as a component of a larger system. For example, the IBM Mainframe Job Entry Subsystem is a group of components that handle input, scheduling, and output. These components work together within the larger computer environment. In many fields, researchers distinguish between "hard systems" and "soft systems." Hard systems are technical and can be studied with quantitative methods like systems engineering. Soft systems involve people and organizations, often requiring participatory designs.

We see systems applied across many different disciplines. In computer science, an information system uses hardware and software to manage data. This includes library systems like the Dewey Decimal Classification. In economics, an economic system is a social institution that handles the production and consumption of goods. It involves people, institutions, and the relationship to resources. Even in sociology, the human brain and mental processes are recognized as systems. These systems can be natural, like galaxies or living things, or artificial, like man-made structures or conceptual knowledge.

Understanding systems helps us connect different ideas. For example, an open system can be viewed as a transformation process. This is often called a "black box" where inputs are consumed and outputs are produced. A passenger ship is a system where the input is people at a departure point and the output is the movement of those people to a destination. By studying these connections, we can see how a change in one part of a system affects the entire structure. This interconnectedness is the core of how the world functions.