High Quality Content by WIKIPEDIA articles! A Gettier problem is any one of a category of thought experiments in contemporary epistemology that seem to repudiate a definition of knowledge as justified true belief (JTB). The category of problem owes its name to a three-page paper published in 1963, by Edmund Gettier, called "Is Justified True Belief Knowledge?". In it, Gettier proposed two scenarios where the three criteria (justification, truth, and belief) seemed to be met, but where the majority of readers would not have felt that the result was knowledge due to the element of luck involved.