The issue of the definition and standards of knowledge is central to the question of whether skepticism in its different forms is true. If very high standards are used, for example, that knowledge implies infallibility, then skepticism becomes more plausible. In this case, the skeptic only has to show that no belief is absolutely certain; that while the actual belief is true, it could have been false. However, the more these standards are weakened to how the term is used in everyday language, the less plausible skepticism becomes. For example, such a position is defended in the pragmatist epistemology, which sees all beliefs and theories as fallible hypotheses and holds that they may need to be revised as new evidence is acquired.
