If you are using Vensim PLE or PLE Plus there is no Model Variable Tool. Just enter widgets per person and new customers as shadow variables then add the remaining variables.
| Ø | Select the Model Variable tool. Click on the view and select the variable new customers then press Enter. |
This adds new customers and its causes to the view. The causes will be on top of one another, so we need to rearrange them for clarity.
| Ø | Using the Move/Size tool (or the currently selected Model Variable tool), rearrange the variables so they sit on the left of new customers. |
| Ø | Select the Model Variable tool. Click on the shadow variable widgets per person. |
This will turn the shadow variable into a normal variable. Because it is a Constant, there are no causes connected to widgets per person.
| Ø | Add the variables and arrows as shown in the diagram below: |
If you are using PLE or PLE Plus your diagram will appear as:
