Research Designs & Experimental Methods

A single-subject experimental design that includes a baseline period (A), a treatment period (B), a return to baseline (A), and a second treatment (B) to establish treatment effects.

ABAB Design

A method to control for order effects in repeated measures designs by varying the order of conditions across participants.

Counterbalanced Design

Neither the participants nor the experimenters know who is receiving the treatment to reduce bias.

Double-Blind Design

A quasi-experimental design measuring a single group repeatedly before and after a treatment/intervention.

Interrupted Time-Series Design

A design used to control for order and sequence effects in repeated measures with multiple treatments.

Latin Square Design

Participants are matched on certain variables to control for confounding factors before being assigned to groups.

Matched Subject Design

A single-subject design where treatment is introduced at different times across behaviors, settings, or subjects.

Multiple Baseline Design

A research design that focuses on the responses of a single participant.

Single-Subject Design

A true experimental design that controls for pretesting effects by using four groups with varying exposure to pretests and treatments.

Solomon Four-Group Design