ABA glossary
Phase change line
Also called condition change line
Definition
A vertical line on a graph marking when conditions changed, such as moving from baseline to intervention. Data points are not connected across it.
Example from a session
A dashed line between sessions 6 and 7 shows when the token system began.
Can you spot phase change line in a scenario?
Practice RBT A.4 with exam-style questions and instant feedback.