In ________, one individual or a small number of individuals are studied intensively.

A) therapy outcome studies
B) human laboratory studies
C) group comparison studies
D) single-case experimental designs

Single-Case Experimental

A research design that focuses on the detailed examination of a single subject or entity to gather in-depth data and study outcomes of interventions.

Intensively

With concentrated and extensive effort or strength; deeply engaged or committed to a task or activity.