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date: 15 September 2019

Abstract and Keywords

Experimental and quasi-experimental research provides the foundation for all evidence-based practice systems that seek to identify and promote the use of social work practices of demonstrated effectiveness. This reflects the prevailing perspective that experimental research is the only definitive basis for claims that certain outcomes can be altered by the effects of a given intervention. At this point in the evolution of social work research, however, the body of work based on experimentation is not extensive. In response to the challenges of implementing experiments related to social interventions, researchers have developed new approaches, such as group randomized designs. Also, newly developed statistical methods may provide ways to control the selection bias inherent in quasi-experimental designs. This entry explores the central place of experimental and quasi-experimental designs in social work research, the challenges of using them, and recent developments that may expand their use.

Keywords: experimentation, intervention, randomization, evidence

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