Epistemological assumptions of modern science

Positivist approach, in modern natural science, believes experience as unique way to the natural sciences. This approach has faced over recent centuries with general acceptance so that the progress of the natural sciences was considered owe this approach. This view was challenged in the second half of the twentieth century and some philosophers and social scientists, to discuss the role of presuppositions, have tried to challenge the exclusivity of the method of natural sciences, At least in some stages.
In this work, have tried to extract, some epistemological assumptions of modern natural science that influenced in selection of data and hypotheses, shaping scientific theories of scientists and even their evaluation. Assumptions that Presence or absence of each of them, in the mental context of scientists in recent centuries, could create a different path in the direction of these sciences, as revised at any of these assumptions could have an impact on the development process of natural sciences.