You can configure a unit alias for a step in a procedure. Because our example in this tutorial is a simple recipe, we will not be using unit aliasing. However, if we were going to create a recipe that required multiple colors to be charged to one blender, unit aliasing would be useful so that we wouldn't need a separate unit procedure for the charging of color from each each color tank. Instead, unit aliases lets us have one unit procedure that charges color with the unit alias determining the tank unit class to be used.