====Input Only Models====

In some cases, there might be a large number of models that use the same inputs.

When this happens, you might want to consider an **Input-Only Model**.

This is a model that only exists to be a source of information to other models. If you were working on a production line for example, the //speed// of that line is likely to be very important.

By creating an 'overall' model and giving it an input called //speed//, you can then reference that point in every other model. 

That way, a single change to your 'overall speed' will change the inputs of //dozens// of different models. It creates a central location to manipulate your common inputs system-wide.