Researchers must attempt to identify everything that might influence the results of an experiment, and do their best to neutralize the effects of everything except the topic of study. Before undertaki...Researchers must attempt to identify everything that might influence the results of an experiment, and do their best to neutralize the effects of everything except the topic of study. Before undertaking the experiment, researchers must attempt to identify everything that might influence the results of an experiment and do their best to neutralize the effects of everything except the topic of study.