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Experimental Design
Experimental design
Introduction

An experimental design is a widely used research strategy used to assess the causal impact of at least one variable (an intervention) on at least one outcome (dependent variable). The design is most suited to research where there is a clear outcome variable and a clearly hypothesized causal variable. In social science research, experimental designs are frequently used in evaluation studies where the impact of an intervention is to be assessed (Orr, 1999). For example, an experimental design might be used to evaluate the impact of a productivity-based bonus scheme on the level of work satisfaction of group members, an idea that might be pictured as shown in Figure 21.

The classic experimental design, which has one treatment or intervention variable and one outcome ...

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