You can customize the way your sketches work with simulation models by adding Input and Output Controls to model views. These can be added alongside model structure or in separate views from model structure. Using Input Output Controls you can build your own "control room" for managing model inputs and viewing simulation results.
In this chapter you will build a control room for an existing model. Input Output Controls are not part of model structure and, therefore, do not influence model behavior. They can easily be added to a finished model to make it easier for another person to use the model. The Controls are supported in the Vensim Model Reader and provide a simple mechanism to make your models easier to consume. Input Output Controls also adapt to changes in model structure quite well. If you rename a variable the corresponding control will automatically be updated. If you delete a variable or change its type any associated controls will no longer work, but this will not stop you from working on the model. Rather they will simply appear blank or inactive.
