ABSTRACT
This chapter considers a description of the designs, the manner in which they deal with threats to internal validity, guidelines for using them, and their advantages and limitations. Multitreatment designs are useful for answering many research questions, including comparisons of two different interventions, analyses of components of treatment packages, and parametric analyses. Multitreatment interference is likely in the comparison phase of the Alternating Treatment Designs (ATD) in the form of rapid alternation effects. The ATD has three major advantages. First, it provides a rapid method for evaluating two or more interventions or two or more variations of an intervention. First, it provides a rapid method for evaluating two or more interventions or two or more variations of an intervention. Second, the ATD is an efficient method for assessing factors maintaining participants' problem behavior and is useful for selecting successful interventions. A third positive feature of the ATD is its flexibility.
