Experimentalism is a research approach or methodology that emphasizes the use of experiments to gather data, test hypotheses, and establish causal relationships between variables. This approach involves manipulating variables in controlled settings to observe their effects on outcomes, allowing researchers to draw more definitive conclusions about cause and effect relationships. Experimentalism is commonly used in fields such as psychology, biology, and social sciences to conduct rigorous, empirical studies that can provide valuable insights into human behavior, biological processes, and social phenomena.