Keeping all parameters but one constant

It is a core scientific principle to only change one of the parameters in an experiment at a time, and keep all others constant, as opposed to picking random parameters (i.e. typically being unable to control the parameters) and performing a factor analysis afterwards.

Is there a short term or phrase to express this concept? I was hoping to find the term in the Wikipedia pages about the Scientific Method or experiments, but both articles seem to deal in loftier terms.

This principle is simply called scientific control, wherein one changes the independent variable while trying to avoid the influence of confounding variables.