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Vensim Help

Before you simulate the model, you should check it for errors in equations and units.  

ØSelect Model>Check Model (or press Ctrl+T), you should get an information box saying "Model is OK."  

If the model has errors, check that the structure is the same as in diagram.  If the structure looks the same, open the Equation Editor on each variable and check the equation against the list above.  

ØSelect Model>Units Check from the menu (or press Ctrl + U); you should get an information box saying "Units are AOK."    

If a units error is generated, read the Output window to see which variables are failing the check.  Open the Equation Editor on each variable and check the units against the equations listed above.  Units that do not check correctly are often an indication of poor or incorrect equation formulations.