In the various Revit software packages, it is possible to hide family parameters so that they are not visible in the family’s properties when in a project file. This is often desirable for situations where the family creator does not want the user to even know that the parameter exists within the Revit family. This can be helpful for keeping the parameter from being easily modified or just keeping the parameter area less confusing. Parameters that are used strictly for calculation purposes are an example of parameters that may be hidden. Parameters that are used behind the scenes to control visibility of objects based upon other criteria is another example of parameters that may be hidden.