Inspection of Sheet Materials—Test of Model Predictions

The two-stage model of inspection performance suggested in a previous paper was tested in laboratory conditions. Four subjects participated in an experiment to estimate the visual search and decision making components of an inspection task using light circular targets of low contrast on a dark empty field. Predicted and measured performance on the inspection task were compared. It was found that the prediction of independence of component tasks and additivity was upheld. In predicting speed/accuracy trade-off, the model's performance was better for the high contrast conditions than for the more difficult low contrast conditions.