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Chapter 7

Chapter 7. Single-Subject Designs. Purpose of Single-Subject Designs. to demonstrate experimental control and intervention effects. ideal for teachers who wish to examine a behavior change for a single child or small group. Baseline and Intervention Conditions.

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Chapter 7

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  1. Chapter 7 Single-Subject Designs

  2. Purpose of Single-Subject Designs • to demonstrate experimental control and intervention effects. • ideal for teachers who wish to examine a behavior change for a single child or small group

  3. Baseline and Intervention Conditions • Baseline condition – condition A • Baseline data are collected on a specific target behavior before an intervention strategy is employed. • Intervention condition – condition B • Data collection continues throughout the intervention condition.

  4. Types of Single-Subject: A-B Design • The A-B design • Simplest single-subject test • Only 2 conditions are used • Condition A: Baseline • Condition B: Intervention

  5. The A-B-A Design • After withdrawing the intervention condition, a second baseline condition is employed • 3 conditions are used • A- Initial baseline • B- Initial intervention • A- Intervention withdrawn and baseline reintroduced

  6. The A-B-A-B Design The intervention condition is used after second baseline - 4 conditions • A- Initial baseline data are collected and recorded • B- Intervention plan is initiated • A- Intervention plan is withdrawn and baseline condition is reintroduced • B- Baseline condition is withdrawn and intervention is introduced a second time

  7. Alternate Treatment Design • To assess the relative effectiveness of two or more treatment conditions • 3 conditions • A- Baseline • B- First intervention • C- First intervention is terminated and a second (different) intervention is introduced

  8. Changing Criterion Design • used to increase/decrease performance of a single behavior by gradually increasing the criterion across several time intervals • the intervention divided into sub-phases • once the criterion achieved, a new criterion is established

  9. Multiple-Baseline Designs • Multiple-baseline-across-subjects • same intervention/different students • Multiple-baseline-across-behaviors • same intervention & child – different behaviors • Multiple-baseline-across-settings design • same intervention & child – different settings

  10. Summary • Single subject designs allow teachers to evaluate intervention effects on a single child or small group of children • Multiple design approaches from simple A-B to more complex • All involve review of baseline & intervention data to determine effectiveness of behavioral change programs

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