A stock is the foundation of any system. Stocks are the events of the system that you can see, feel, count, or measure at any given time. Stocks change over time due to the actions of a flow. Flows are filling & draining, bidirectional outcome cycles. A stock, then, is the present memory of the history of changing flows within the system.

Stocks & Flows  

<ol><li>Can you identify parts?</li><li>Do the parts affect each other?</li><li>Do the parts together produce an effect that is different from the effect of each part on its own?</li><li>Does the effect, the behavior over time, persist in a variety of circumstances? </li></ol>

How To Spot A System 

Systems thinkers use graphs of system behavior to understand trends over time, rather than focusing attention on individual events. We also use behavior-over-time graphs to learn whether the system is approaching a goal or limit, and if so, how quickly. The variable on the graph is often a stock or a flow.

Reading Systems 

A system is an interconnected set of elements that is coherently organized in a way that achieves something . These systems must be comprised of three things: <ul><li class="ql-align-justify">Elements </li><li class="ql-align-justify">Interconnections </li><li class="ql-align-justify">Function/purpose</li></ul>

What Is A System?

<ol><li>Elements of your digestive system include teeth, enzymes, stomach, & intestines. The function of this system is to break down food into its basic nutrients & transfer it into the bloodstream while discarding the waste. </li><li>A football team is a system with elements such as players, coach, field, & ball. Its interconnections are the rules of the game, the coach's strategy, the players' communications, & the laws of physics that govern the motions of ball & players. Its purpose is to win, have fun, make money, get exercise or all of the above. </li></ol>

Examples Of A System 

A stock takes time to change, because a flow takes time to flow

Changes In Stocks & Flows

Change how you see your organizational structure 

In the years following her role as the lead author of the international bestseller, Limits to Growth—the first book to show the consequences of unchecked growth on a finite planet— Donella Meadows remained a pioneer of environmental and social analysis until her untimely death in 2001. Thinking in Systems, is a concise and crucial book offering insight for problem solving on scales ranging from the personal to the global. Edited by the Sustainability Institute’s Diana Wright, this essential primer brings systems thinking out of the realm of computers and equations and into the tangible world, showing readers how to develop the systems-thinking skills that thought leaders across the globe consider critical for 21st-century life. Some of the biggest problems facing the world—war, hunger, poverty, and environmental degradation—are essentially system failures. They cannot be solved by fixing one piece in isolation from the others, because even seemingly minor details have enormous power to undermine the best efforts of too-narrow thinking. While readers will learn the conceptual tools and methods of systems thinking, the heart of the book is grander than methodology. Donella Meadows was known as much for nurturing positive outcomes as she was for delving into the science behind global dilemmas. She reminds readers to pay attention to what is important, not just what is quantifiable, to stay humble, and to stay a learner. In a world growing ever more complicated, crowded, and interdependent, Thinking in Systems helps readers avoid confusion and helplessness, the first step toward finding proactive and effective solutions.

corporateculture

Corporate Culture

books

Books

leadershipandmanagement

Leadership & Management

The classic book on systems thinking—with more than half a million copies sold worldwide! "This is a fabulous book... This book opened my mind and reshaped the way I think about investing."—Forbes "Thinking in Systems is required reading for anyone hoping to run a successful company, community, or country. Learning how to think in systems is now part of change-agent literacy. And this is the best book of its kind."—Hunter Lovins In the years following her role as the lead author of the international bestseller, Limits to Growth—the first book to show the consequences of unchecked growth on a finite planet—Donella Meadows remained a pioneer of environmental and social analysis until her untimely death in 2001. Thinking in Systems is a concise and crucial book offering insight for problem solving on scales ranging from the personal to the global. Edited by the Sustainability Institute’s Diana Wright, this essential primer brings systems thinking out of the realm of computers and equations and into the tangible world, showing readers how to develop the systems-thinking skills that thought leaders across the globe consider critical for 21st-century life. Some of the biggest problems facing the world—war, hunger, poverty, and environmental degradation—are essentially system failures. They cannot be solved by fixing one piece in isolation from the others, because even seemingly minor details have enormous power to undermine the best efforts of too-narrow thinking. While readers will learn the conceptual tools and methods of systems thinking, the heart of the book is grander than methodology. Donella Meadows was known as much for nurturing positive outcomes as she was for delving into the science behind global dilemmas. She reminds readers to pay attention to what is important, not just what is quantifiable, to stay humble, and to stay a learner. In a world growing ever more complicated, crowded, and interdependent, Thinking in Systems helps readers avoid confusion and helplessness, the first step toward finding proactive and effective solutions.

Stocks & Flows

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