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Multiple-Baseline Designs. Description: Intervention evaluated by examining Bx across different baselines Intervention is introduced to different baselines at different points in time Functional relationship: Bx changes only when intervention is applied. Multiple-Baseline Designs (Cont.) .

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multiple baseline designs
Multiple-Baseline Designs
  • Description: Intervention evaluated by examining Bx across different baselines
    • Intervention is introduced to different baselines at different points in time
    • Functional relationship: Bx changes only when intervention is applied
multiple baseline designs cont
Multiple-Baseline Designs (Cont.)
  • Three types of MBL designs
    • MBL across subjects
      • BL and Tx phase for same target Bx of 2 or more subjects
    • MBL across behaviors
      • BL and Tx phase for 2 or more behaviors of the same subject
    • MBL across settings
      • BL and Tx phase for 2 or more settings in which the same Bx of the same subject is measured
multiple baseline designs cont3
Multiple-Baseline Designs (Cont.)
  • MBL designs used when:
    • Interested in the same target Bx exhibited by multiple subjects
    • You have targeted more than one Bx of the same subject
    • You are measuring a subject’s Bx across 2 or more settings
  • MBL designs useful when:
    • Cannot use an ABAB design
multiple baseline designs cont4
Multiple-Baseline Designs (Cont.)
  • MBL across subjects
    • Tx is staggered over time
    • Experimental control demonstrated when Bx changes for each subject only after Tx is implemented
  • MBL across behaviors
    • Tx is staggered across Bxs
    • Experimental control demonstrated when Bx changes only after Tx has been implemented for that Bx
multiple baseline designs cont5
Multiple-Baseline Designs (Cont.)
  • MBL across settings
    • Same Bx, same subject, but Tx is staggered across settings
    • Experimental control demonstrated when Bx changes only after Tx is implemented in each setting
design variations
Design Variations
  • Number of Baselines
    • Minimum of 2 baselines
    • Number of baselines contribute to strength of demonstration
    • Better to include several baselines in case one of the baselines does not change
  • Partial Applications of Treatment
    • If Tx has no affect on first BL, may not apply this Tx to other baselines
    • One BL may never receive Tx
problems limitations
Problems & Limitations
  • Interdependence of Baselines
    • Change in one of the baselines carries over to another BL even though the intervention has not been applied
  • Inconsistent Effects of the Intervention
    • Some Bxs are altered when the intervention is introduced and others are not
  • Prolonged Baselines
    • Withholding Tx may be unethical
    • Prolonged baselines may result in performance improving before Tx has been applied
    • Undesirable Bxs may emerge