A controlled experiment describes the use of

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A controlled experiment requires the use of separate control and experimental groups in order to isolate and compare the effects of a single variable. Precise and accurate measurements may be important components of a controlled experiment, but they are not sufficient on their own to make an experiment truly controlled. The presence of more than one variable changing separately would actually make an experiment uncontrolled, since it would be difficult or impossible to determine the cause-and-effect relationship between the independent variable and the observed outcome. Careful testing of the hypothesis is also an important aspect of an experiment, but it too is not sufficient on its own to make an experiment truly controlled.

A Controlled Experiment Describes the Use of