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Making Thinking Visible: Stocks and Flows
Stocks and Flows are the basic building blocks of system dynamics maps and models. Using stocks and flows allows people to make visible both concrete and abstract concepts. A stock is an accumulation (trees in the forest, happiness of a child, water in the bathtub). A flow changes a stock over time. An inflow adds to the stock while an outflow subtracts with the stock. Like Behavior over Time Graphs, stocks and flows depict how a system changes over time, but they also represent interdependencies in a system. The following articles and curriculum provide a gateway to using this powerful tool in the classroom.
Making Friends from The Shape of Change
Getting Started: Five lesson plans to help teachers introduce System Dynamics to their students
Everyday Stocks and Flows: Problem Sets for Middle Grades
Use Stocks and Flows to Build a Personal Finance Model