THERPTechnique of Human Error Rate Prediction
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A large number of techniques are cited in the literature; early methods include THERP (The Human Error Rate Procedure), Data Store (a data bank of performance data on the use of common controls and displays) and Siegel's Simulation (a computer model of tasks)[29].
Steps in a THERP analysis are shown diagrammatically in Figure 4[30].
Any decompositional approach to analysing human error (of which THERP is a well-established example) is based on reductionist principles and would therefore fail to detect failures of a systemic nature.