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Upon completion of the Accelerated CAT-ASVAB Project (ACAP) system, described in the previous four chapters, the first empirical study to be conducted was an evaluation of the human-machine interface and attitudes toward CAT-ASVAB. By 1986, at the time this study was conducted, thousands of recruits had taken CAT-ASVAB on the experimental system. Nearly all participants appeared to understand the computer-presented instructions well enough to proceed through the battery with a minimum of test administrator intervention. However, before CAT-ASVAB could be used operationally, concerns about the user interface needed be addressed. It was believed that the favorable results obtained in prior studies on CAT-ASVAB concerning the instructions may not generalize to the population of interest: military applicants. This concern was fueled by at least three important observations. First, the instructions for the operational ACAP system had undergone extensive revisions t o accommodate necessary changes for an operational battery. Second, everyone participating in prior studies had taken the ASVAB before (on paper-and-pencil). Because of the simi-HUMAN FACTORS IN THE CAT SYSTEM 157

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