Exercise 4 is about calibrating a Stella Model. Here is a Stella model, which output needs to be calibrated to the "data" curves that are provided within the model. The major advantage of this study from the ones that we find in our real life modeling, is that we KNOW that there exists a perfect fit to the "data" with a proper choice of the parameters and initial conditions in the model. That is because the "data" have been actually generated by this same model, but run with a different set of parameters and initial conditions. Now your goal is to find this magic set that will bring the trajectories back to the sought dynamics.
The model that you need to calibrate can be downloaded here.
Download for MAC 
Download for Windows 
Click here to Upload your results Please use your name as part of the uploaded file name. For example, if John Smith is uploading his model for Exercise 4, he would call it smithje4.stm
Do not worry if the file you downloaded does not appear on the directory listing - I've made this a write-only directory. So once the file is there, it's there - you should not be able to get it back.