有一套理論為葛梯爾問題，呢個問題反駁咗葛梯爾問題。當中提出咗上述三個條件就算得到滿足，喺某啲情況下仍然唔可以講“S知道P”。對於呢個情況，羅伯特·諾齊克提出咗“真理追蹤”，認為只要合理解釋“確證”嘅意義，就能夠化解葛梯爾嘅反駁。佢保留原先JTB理論入面嘅前面兩個條件，然後將第三個“確證”條件改成“如果P唔係真，S就唔相信P；如果P係真，S就相信P”。
There is a theory called the Gettier problem, which refutes the Gettier problem. It states that even if the above three conditions are met, it is still not possible to say "S knows P" in some cases. In response to this situation, Robert · Nozick proposed uranium truth tracking uranium, arguing that as long as the significance of the investigation is reasonably explained, the rebuttal of Gettier can be resolved. He retains the first two conditions of the original JTB theory, and then changes the third "confirmation" condition to "If P is not true, S does not believe P, and if P is true, S believes P".