Now that you know about stocks and flows, it’s important to realize that they’re constantly changing. On the other hand, flow is the change in stock over time as a result of Examples include births and deaths or purchases and sales. Flow is the change over time of stock as a result of inflows (additions) and outflows (subtractions). For example, water in a bathtub or money in a bank account. Stock is the quantity at a given time, which can be counted or measured. There are two types of quantities: stock and flow. For example, a football team might acquire an entirely new roster but still play with the same relationship between positions and unified purpose of winning games.įurthermore, the behavior of a system breaks down into stocks and flows that change over time. The relationships and purpose of a system will determine it, even if its elements change. For instance, a government might say that it has a goal of environmental protection, but if it doesn’t put its money where its mouth is (i.e., actually do something to protect the environment), then environmental protection isn’t really the government’s purpose. The purpose of a system is defined by how the system behaves, not its stated goals. In a university’s system there might be standards for admission and testing. For example, in a tree’s system there are relationships between its parts like chemical reactions and photosynthesis. However, whether the elements are physical or not, they’re still connected to each other and work together. These elements can be both tangible (e.g., roots) and intangible (e.g., academic prowess). That’s because a system is simply a group of elements, connected by relationships and paired with a purpose. Have you ever paused to identify the different systems around you? If so, you’d see that they’re everywhere-from your body to your favorite football team to the company you work for and the city where you live. Big Idea #1: A system is a group of connected elements with a shared purpose. Also, don’t expect to get four bushels of wheat from your field if you only put ten pounds of fertilizer on it because two bushels was all you got last time with just ten pounds of fertilizer. You will also see that feedback plays an important role in these systems as well as how corruptions can occur within them. Systems are everywhere in our world: your body is a system, the solar system is a system, even the economy is a system. In this passage, you’ll learn about systems and how they work. Your heart pumps blood, your kidneys remove waste from your blood, and so on.īut what about a soccer team? Or a company? Could they be considered systems too? Absolutely! Systems are everywhere, and some are more obvious than others. Your body is a system of various organs that work together to keep you alive. 1-Page Summary of Thinking In Systems Overview
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