6.9) Create A New Model

When starting Vensim, you will typically be presented with a new blank model. In case this does not happen, or in case you already have a model open but want to start working on a new one, here is how to make a new model:

1. Click the “New Model” button in the main toolbar. This will bring up the “Model Settings” window, with the “Time Bounds” tab selected
2. The options presented are relevant to simulation models. The first three options allow you to set the initial and final time of simulations you will run, as well as the size of time steps. The tickbox and “SAVEPER” options set how often results in a simulation are recorded; the default setting saves every step. The final two options set the units used for time in simulations and the type of numerical integration used (set this to RK4)
3. Click the “OK” button and you will be presented with a blank new model. To return to the model settings menu at any time, click on “Model” – “Settings” in the main menu
4. It is good practice to save the model before you start, and at regular intervals during development. Do this using the “File” – “Save As..” selection from the main menu as you would in any other program