Abstract
The quasi-experimental designs compare the outcomes of social work for a group of clients who receive a novel intervention that is the focus on investigation, against the outcomes observed by a similar group of clients who received either no treatment (a control group) or an alternative treatment (a comparison group). Among these methods are the posttest-only control group design, the posttest-only comparison group design, the pretest-posttest no-treatment control group design, the pretest-posttest alternative treatment comparison group design, the swtiching replications design, and dismantling studies, wherein a 'complete' intervention's outcomes are compared with the outcomes following receipt of a partial intervention. The role of placebo control groups is introduced as a means of providing a more rigorous appraisal of the specific effects of an intervention, compared to its nonspecific effects.
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