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MODELING WITH VENSIM 101:
BASICS
First: System dynamics…

 How is my inventory
  policy affecting my
       cash flow?           Is an ERP the
            ...
Stocks
     People
     Goods
     Rabbits
     Meters
    Gallons
    Pollution

                                RABBITS ...
Stocks are like a glass… they fill up… or drain out…
FLOWS
                                           People/year
                                           Goods/Shift
      ...
Fills it

              Rabbits
Births                  Deaths
                         Drains
                           ...
If it’s not a stock… if it’s not a flow
It‘s either an auxiliary variable or a
constant.
Population Dynamics


                         Conceptual
                         Model



                   Or…

Stock
...
Our first model

       Can you picture it? What’s the main stock here??

         What’s feeding that stock? What are the...
Our first model: The bones
It should look something like this:
Let’s build that up!!!


    Flow
Let’s build that up!!!
Now some ecuations
Performance Indicators
Simulation!!!
Results
Mario Andrés López

 mlopez0301@gmail.com
Modelling with Vensim 101: Basics
Modelling with Vensim 101: Basics
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Modelling with Vensim 101: Basics

A quick introduction to System Dynamics Simulation using Vensim.

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Modelling with Vensim 101: Basics

  1. 1. MODELING WITH VENSIM 101: BASICS
  2. 2. First: System dynamics… How is my inventory policy affecting my cash flow? Is an ERP the ‘answer’ to our problems? How can people respond to a tax increment? It’s all about understanding the structural causes that affects the system
  3. 3. Stocks People Goods Rabbits Meters Gallons Pollution RABBITS Whatever you see when picturing it… those are stocks! Let’s take a mental photo of… let’s say a bunny colony
  4. 4. Stocks are like a glass… they fill up… or drain out…
  5. 5. FLOWS People/year Goods/Shift Rabbits/Month Meters/Second Pollution/year Unit/Time How do you fill up/drain out that glass?
  6. 6. Fills it Rabbits Births Deaths Drains it Warning! Rabbits in the area
  7. 7. If it’s not a stock… if it’s not a flow It‘s either an auxiliary variable or a constant.
  8. 8. Population Dynamics Conceptual Model Or… Stock and flows model
  9. 9. Our first model Can you picture it? What’s the main stock here?? What’s feeding that stock? What are the flows? Let’s go to a warehouse… a quite simple one
  10. 10. Our first model: The bones It should look something like this:
  11. 11. Let’s build that up!!! Flow
  12. 12. Let’s build that up!!!
  13. 13. Now some ecuations
  14. 14. Performance Indicators
  15. 15. Simulation!!!
  16. 16. Results
  17. 17. Mario Andrés López mlopez0301@gmail.com

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