Re-Definition of Knowledge Based on Virtue’s Function

After the Gettier’s problems on formal definition of knowledge, it was done very efforts to change this definition and add some reservations to present an inclusive and exclusive definition, that externalist approaches and justifying knowledge on elements out of the consciousness of the epistemic agent are some examples in this way. Recently, virtue approaches to knowledge with re-definition of knowledge and composition of epistemic Internalism and externalism, interfere a new condition in the definition of knowledge: the effect of activity of Intellectual virtues in justification and truth of beliefs. Thus, epistemic agent must employ these virtues in his belief-processes, so that these truthconducive virtues help him in this way. Virtue epistemology has two versions: virtue reliabilism and virtue responsibilism, everyone has a special view of Intellectual virtues and recommends a special mechanism for acquisition of knowledge. In this article, with emphasize on Zagzebski’s version, it would analyzed the process of effect of these virtues on acquisition of knowledge and quantity of its success in scape of Gettier’s problems.