Changing One Variable at a Time A super important part of our treatment approach is to change only one variable at a time – either the person, the place, or the activity. This video shows how we do that to help set children up for success. Date: August 30, 2017Topic: Selective Mutism Email BACK PREVIOUSHow to Fade in a New Adult with PCIT-SM NEXTWhat are the keys to effective discipline?