另一種外在主義嘅解釋係基於產生真信念之後確證嘅可靠性。產生信念嘅過程同方法一定要係可靠、獨立於主觀嘅信念。只要客觀方法有可靠性，噉樣獲得嘅就係知識。呢個方法可以解釋好多葛梯爾式嘅反例，但是都有反對者提出咗“透視眼反例”：
Another externalist explanation is based on the reliability of confirmation after the generation of true beliefs. The process and method of generating beliefs must be reliable and independent of subjective beliefs. As long as the objective method is reliable, knowledge is obtained in this way. This approach can explain many Gettier counterexamples, but there are also opponents who propose "clairvoyant counterexamples":