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Simultaneous / Alternating Treatment Designs

Simultaneous and Alternating Treatment Designs, also known as Multi-element baseline or Concurrent schedule designs, offer an efficient method for comparing the effects of multiple treatments. These designs involve alternating treatments in various ways, associating distinct stimuli with each. They prioritize experimental control, allowing for rapid comparisons and the assessment of individualized treatments. While beneficial for observing treatment effects quickly, they come with challenges such as multiple treatment interference and potential confusion for clients due to complex conditions. Careful selection and implementation are crucial for effective outcomes.

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Simultaneous / Alternating Treatment Designs

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  1. Simultaneous / Alternating Treatment Designs

  2. Also known as: • Multi-element baseline design • Multiple schedule design • Concurrent schedule design

  3. Overview • Efficient for comparing effects of 2 or more treatments • Alternated in a variety of ways • A distinct stimulus is often associated with each treatment • Involves prediction, verification, and replication

  4. Logic of Simultaneous or Alternating Treatments Design • Experimental control is demonstrated with different levels of response in different treatments • Allows for quick comparison • Stresses importance of evaluating individualized treatments

  5. Design Variations • Single phase without no-treatment control condition • Single phase with one no-treatment control condition • Two phase with initial baseline • Three phase with baseline and final best treatment phase

  6. Without No-Treatment Control Condition

  7. With No-Treatment Control Condition

  8. With Baseline and Final Best Treatment Phase

  9. Design Advantages • Does not require treatment withdrawal • Speed of comparison • Minimizes irreversibility problem • Minimizes sequence effects • Can be used with unstable data • Can be used to assess generalization of effects • Intervention can begin immediately

  10. Design Disadvantages • Multiple treatment interference • Unnatural nature of rapidly alternating treatments • Limited capacity (max. of 4 conditions) • Selection of treatments – should be significantly different from one another

  11. Conclusions • Good way to examine a lot of options • Need to be careful to not do too many • Client may become overwhelmed • Client may become confused about what to do • You may lose track of what you are doing.

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