Experimental evaluation is a research method used to test the effectiveness or impact of a particular intervention, program, policy, or treatment. In this research approach, researchers design controlled experiments in order to compare outcomes between a group that receives the intervention (experimental group) and a group that does not (control group). By carefully manipulating variables and controlling for confounding factors, experimental evaluation allows researchers to draw causal conclusions about the effectiveness of a particular intervention. This method is considered the gold standard for determining the efficacy of interventions in a wide range of fields, including psychology, public health, education, and economics.