Background
The Technique for Human Error Rate Prediction (THERP) is a first generation methodology, which means that its procedures follow the way conventional reliability analysis models a machine. The technique was developed in the Sandia Laboratories for the US Nuclear Regulatory Commission . Its primary author is Swain, who developed the THERP methodology gradually over a lengthy period of time. . THERP relies on a large human reliability database that contains HEPs, and is based upon both plant data and expert judgments. The technique was the first approach in HRA to come into broad use and is still widely used in a range of applications even beyond its original nuclear setting.
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