The scientific processes that are important for forming and testing solutions to problems, or theorizing about how or why things work.
It tries to minimize the effect of "faith" or prejudice of the experimenter so that the process is valid anywhere in our world.
For example, they can mistake a hypothesis for an explanation of a phenomenon without performing experiments. Or they can fail to validly report for errors, such as measurement errors. Or they can take no notice of the data that does not support the hypothesis.