Examining and Enhancing the Methodological Quality of Nonconcurrent Multiple-Baseline Designs.

Area of Science:

• Single-case research design methodology
• Behavioral research methods

Background:

• The nonconcurrent multiple-baseline design is a valuable tool in single-case research.
• Recent recommendations by Slocum et al. (2022) addressed its credibility and validity.
• Further methodological improvements are needed to enhance its standing.

Purpose of the Study:

• To build upon Slocum et al.'s recommendations for the nonconcurrent multiple-baseline design.
• To propose upgrades for replication and randomization within this design.
• To clarify the comparative utility of nonconcurrent versus concurrent multiple-baseline designs.

Main Methods:

• Conceptual analysis of single-case research designs.
• Methodological recommendations for design upgrades.
• Comparative discussion of nonconcurrent and concurrent multiple-baseline designs.

Main Results:

• Replication and randomization upgrades can enhance the nonconcurrent multiple-baseline design.
• The enhanced nonconcurrent design can be an acceptable option for researchers.
• The concurrent multiple-baseline design is still generally recommended as the primary choice.

Conclusions:

• The nonconcurrent multiple-baseline design, with proposed upgrades, is a methodologically sound option.
• Researchers should consider these enhancements to improve design rigor.
• The concurrent multiple-baseline design remains the preferred standard in most single-case research scenarios.