Physico–statistical models based on the residual defectiveness of structural materials - Probabilistic Safety Assessment for Optimum Nuclear Power Plant Life Management (PLiM) - page 138

5.18 Dependence of the detectability of defects on the number
of inspections (1) carried by different NDT operators (2).
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5.19 Dependence of the detectability of defects on defect type
and serial number of NDT inspector N (the test sample DN 800).
Investigation of the influence of the 'human factor' on test results
The influence of the 'human factor' on the test results can be seen from
Fig. 5.5, where the curves X 1 - X 4 , obtained by different NDT inspectors
under the same experimental conditions, significantly differ.