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Br J Nurs. 1997 Jan 23-Feb 12;6(2):116-9.

Single-case experimental designs. 2: Common examples.

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  • 1Postregistration Education Department, School of Nursing and Midwifery Studies, University of Wales, Bangor, Gwynedd.


This article describes and discusses some commonly used single-case experimental designs, including reversal and non-reversal designs. The A-B-A-B design is recommended for use when reversal designs can be used and when the patient's treatment phase needs to be maintained. The B-A-B design is used in situations when studying an intervention or treatment which is already in progress. The A-B1-A-B2-A-Bn design is useful when the aim of the researcher is to study the effects of different levels of a specific independent variable. Two types of non-reversal multiple baseline designs are discussed here.

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