Dogmatism, knowledge is not a problem, objects are captured directly by the subject. Skepticism, knowledge is not possible, the subject can not grasp the object or can not prove their arrest. There are also mitigated skepticism when it refuses the certainty and the probability is accepted. Subjectivism and relativism, the first believes that something can be true for one person but not for others and the second thinks that knowledge is relative to cultural context. Pragmatism only knowledge is generated from human needs, these are its foundation, human knowledge has meaning only in the practical field, the truth is the congruence between the goals and practical thoughts. Criticism, proposes to have confidence in human knowledge in general and at the same time distrust all knowledge determined not to be subjected to criticism. Rationalism, epistemological view which holds that it is thought, reason, the main and sole source of human knowledge (Descartes). Empiricism says that knowledge comes only from experience, direct contact with reality (Locke and Hume). Intellectualism, a position that tries to mediate between rationalism and empiricism (Aristotle). apriorism second attempt at mediation, consider that in the know necessarily involves the experience and a priori elements which are inscribed on the reason (Kant).