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Two-component model of security inspection : application and findings

Security inspection is a form of visual inspection that presents a changing set of potential targets, i.e. threats. However it has not been shown how the unique features of security inspection fit into more general models of industrial and other inspection tasks. Spitz and Drury [2] developed equations based on modeling the inspection task as containing both search and decision components. The current research tested the applicability of this twocomponent model to x-ray screening, and utilized the model to determine how a training program (ie. X-Ray Tutor) affected the search and decision parameters. Performance data from 416 airport screeners evaluating 40 x-ray images of passenger bags was analyzed. The analysis found model vs. data r values averaging above 0.8, showing the applicability of the model to a security x-ray task. [Note: Due to security reasons, all detection measures have been multiplied by an arbitrary constant.]