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Item Research Methods in Social Relations-Randomized Experiments(SPSSI, 1986) Kidder, Louis H.; Judd, Charles M.Randomized experiments are the method par excellence for examining causal relationships and concluding "this caused that." They enable a researcher to test and rule out the primary threats to internal validity: maturation, history, Instrumentation, mortality, and selection. Experiments that contain more than one independent variable provide tests of both the main effects and the interaction effects of those variables.