Quine on Method of Epistemology

Quine says that the method of epistemology is not different from the method of empirical science and recommends that by using psychology, Psycholinguistics and Neurology, we shoud do epistemology. The reason of denial of distinction between the method of science and epistemology is the denial of a boundary between analytical propositions and synthetic propositions that rooted in his holism theory. This sameness of method is called naturalism and has two reasons: the first is the defect of the method of traditional empiricism that wanted to describe the structure of human knowledge on analytical method. The secend is the success of empirical science in many areas. In assessment of Quine's theory, we can say that using different science, however, is important but his recommendation has weaknesses.That the new empirical science is successful in prediction do not show that it is true in it's explanation. More or less, the old knowledge of human was successful in prediction but nowadays we believe they were wrong in their explanation. This epistemology that he is looking for is a new science that can not fulfill the duty of traditional epistemology that was looking for a criteria for truth, but only show the psychological manner and language of scientists. So we must look for a kowledge that is standing outsid the science and in a normative way can show the relation between kowledge and reality.