Parameter Study
Parameter study refers to creating visualizations in grid with one or more parameters changing across each view in the grid so that users can visually compare the effects of the parameter change.
Creating Parameter Studies
ParaView provides a collection of views that can be used to generate such parameter studies. These are referred to as "Comparative" views. When ParaView starts up, either close the active viewport, or split the viewport and choose one of the comparative views to create them.
Once created, these act exactly like regular views, except that into of having just one viewport, these views have a grid of viewports in which the data is displayed.
To setup a parameter study, you need to open up the "Comparative View Inspector" (accessible from the View menu). The Comparative View Inspector reflects the state of the active view, so ensure that the comparative view you want to create your parameter study in, is active (by simply clicking on it).