| Ø | Select the Variable tool. Click once just to the left of and below new customers then type the name time to become customer and press Enter. |
| Ø | Click once just right and below exiting customers and type the name product life and press Enter. |
| Ø | Select the Arrow tool. Click once on Potential Customers, then once on a blank part of the sketch above and between Potential Customers and new customers, then once on the valve attached to new customers. |
A curved arrow will join the Level and the Rate valve. Vensim allows you to connect arrows to either the Rate name or the Rate valve. The Rate name and valve are structurally the same.
| Ø | Click once on time to become customer then once on the Rate name new customers. |
| Ø | Click once on Customers then once on the valve attached to the Rate exiting customers. |
| Ø | Click once on product life then once on the Rate name exiting customers. |
Your diagram should now look like the one below:
