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Abstract
The treatments implemented in behaviour modification programs are often dependent upon the research literature available to the therapist, or the therapists recent experience with different kinds of treatments. However other treatments could be more effective. It would be of great interest to determine which one of several possible treatments, or combinations, is the most effective. This article presents a design (Multiple Treatment Design) that is sufficient to compare the differential effects of two or more treatments in one person in order to determine which of them that is the most effective. The article describes the use of terms in some of the available literature, and suggests terms suitable in applied behaviour analysis. The advantages of, and questions concerning the validity in the Alternating Treatments Design are discussed.