Single subject design may also be referred to as

A) intensive research.
B) time-series design.
C) ideographic research.
D) All of these are correct.

Single Subject Design

Single subject design is a research method used in the behavioral sciences where experiments are conducted with a single subject, or one subject at a time, to ascertain the effect of an intervention.

Time-Series Design

A research method that involves repeated observations of the same variables over a period of time, often used to assess the impact of interventions.

Ideographic Research

A research approach focusing on understanding the unique aspects of individual cases or entities, rather than seeking to generalize findings across populations.