The answer is empiricism. It believes that science begins with the premise that knowledge should first be acquired through observation.
In the philosophy of science, empiricism places a strong emphasis on evidence, particularly that which comes from experiments. All theories and hypotheses must be checked against observations of the natural world as part of the scientific method, as opposed to relying entirely on presumptions, feelings, or revelation. Natural scientists frequently use the term empiricism to refer to the idea that knowledge is based on experience and that it is tentative and probabilistic, susceptible to ongoing modification and falsification. The scientific process is guided by empirical investigation, which includes experiments and approved measurement equipment.
The need that conclusions be empirically based on the evidence of the senses is a fundamental principle of science and the scientific process.
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