In single-case research, what is the definition of a phase change?
A) The point at which the subject begins to show a response to the treatment
B) The point at which the treatment begins to lose effectiveness
C) The point at which the treatment is switched from one subject to another
D) A change from baseline to treatment or from treatment to baseline

Question

Quizplus · Accepted Answer

A phase change is a shift from one condition (baseline or treatment) to another. It can be either from baseline to treatment or from treatment to baseline. This change is used to assess the effects of the treatment, and it marks a new stage in the experiment. Therefore, answer D is the correct definition of a phase change.

In Single-Case Research, What Is the Definition of a Phase