One issue with using an experimental research design in evaluation studies is the inability to randomly assign people into the control or experimental groups.

Question

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Experimental research designs often rely on the random assignment of participants to control and experimental groups to ensure that each group is similar in all respects except for the intervention being tested. However, in many real-world settings, ethical, practical, or logistical reasons can make random assignment difficult or impossible, thus posing a challenge to using experimental designs in those contexts.

One Issue with Using an Experimental Research Design in Evaluation