However, many systems thinkers are also interested in how human social systems affect the larger ecological systems in our planet. Every system has a purpose within a larger system. All of a system's parts must be present for the system to carry out its purpose optimally. If you removed any one of these components, this system could no longer function. A system's parts must be arranged in a specific way for the system to carry out its purpose.
Systems change in response to feedback.
The word feedback plays a central role in systems thinking. Feedback is information that returns to its original transmitter such that it influences that transmitter's subsequent actions. Systems maintain their stability by making adjustments based on feedback. If you get too hot, your body produces sweat, which cools you back down. For example, suppose a fire breaks out in your town.