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...Experimental quasi and ex post facto designs chapter cs research seminar joy rahman cause effect we often want to know what leads that is identify relationships utsa studies the most convincing way achieve use an design in such a researcher considers many possible factors might or influence particular condition phenomenon then attempts control for all influential except those whose effects are focus of investigation example clarify measure performance newly invented algorithm over existing b do so must discard external impact difference problem set size operating system underlying hardware capacity etc...