Introduction

Once you are comfortable building flow chart models and viewing basic graphs and tables in Vensim PLE, you will probably want to start refining your models. An easy way to do this is to incorporate inpupt/output objects in your window using the I/O Obejct button .

On the input side of things, slider bars allow you to build an interface for interactively exploring your model. They allow you to quickly change variable and parameter values. Slider bars become active in SyntheSim mode , so you will able to immediately view the effect of changes you make.

Regarding output, custom graphs that you build in the Control Panel can be fixed to your window. This removes the hassle of cycling through multiple windows to find your ouptut. These permanent graphs will also respond instantly to changes in the model when SyntheSim is on.

Continuing to build on the model of disease covered in the tutorial, this lesson covers the following aspects of adding Input/Output Objects:

• Slider Bars for Constant-valued Auxiliary Variables
• Slider Bars for Setting the Initial Value of a Box Variable
• Making a Switch out of a Slider
• Adding Custom Graphs/Tables to the Build Window