A single subject or intensive experimental design that involves. (1) Obtaining pretreatment measures (baseline) of several different behaviors; (2) applying the intervention or experimental procedure to one of the behaviours until it is changed substantially while continuing to record the baseline measures of the other behaviors-, (3) applying the intervention to a second behaviour as in item 2, and so on. This procedure is continued until it becomes apparent that each behaviour changes concurrently with the intervention.