The scientific method was devised to allow scientists to conduct investigations objectively. Here's the method in a nutshell.
You will need
Step 1 Make an observation Observe some occurrence or group of occurrences, and describe it.
Step 2 Make a hypothesis Formulate a hypothesis — an educated guess — to explain the observation.
Scientists often express hypotheses as cause-effect relationships or mathematical expressions.
Step 3 Use the hypothesis Use the hypothesis to predict new behavior, or the quantitative results of new observations.
Step 4 Perform an experiment Perform an experiment to test the predictions of the hypothesis.
Step 5 Accept or reject the hypothesis Elevate the hypothesis to a theory if the experiment supports the hypothesis. If the experiment does not confirm it, the hypothesis must be discarded or modified.
The Greek philosopher Aristotle is credited with being one of the fathers of the scientific method.