In our previous studies on visualized procedure manuals, qualitative evaluations were made by four participants. The visualized procedure manuals, we tried to make and evaluate, were not only composed of descriptive texts but also of many photos and diagrams. Although the evaluation was based on the participants’ subjective answers, the evaluation results suggested that the visualized procedure manuals were easier to understand than the conventional procedure manuals. For making the effectiveness of visualized procedure manuals clear, we proposed six types of visualized procedure manuals and quantitatively-evaluated those effectiveness in this study. The respective visualized procedure manuals instructed the procedure of maintenance work on a small horizontal pump and a vacuum circuit breaker in a power plant. The quantitative evaluation was based on a questionnaire survey of 40 maintenance workers. The result of the questionnaire survey indicated that the visualized procedure manuals were preferred in terms of usefulness by the participants. Therefore, our knowledge on the visualized procedure manual could be valid. Further, we obtained the knowledge about the effective formats, photographs and diagrams, and the notation methods for making visualized procedure manuals as related to field works or training novice workers.

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Combiner head-up display (HUD) has a screen between windshield and driver’s eye-point, and this type of HUD has large structural advantage. However, there are technical problems on ergonomics to design its layout. In this study, depression angle requirements were examined through laboratory experiments focused on the human visual field characteristics. Interference feeling which is elicited by the combiner in driver’s front view was studied by an experiment with a method of adjustment. As a result, it turned out that the depression angle to the top edge of combiner required minimum 8.0 degree to reduce unpleasant feeling, and required minimum 5.8 degree to accept the interference of the combiner. Next, in order to clarify the depression angle requirement which allows a driver to perceive a change in the front view even if the driver is looking at visual information on the combiner, upper useful field of view was measured through an experiment with peripheral vision task. It was thought that the depression angle to the visually presented information should not exceed 9 degree.

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Today, various safety management activities are being implemented in high-risk organizations. However drop in member’s motivation because of activity mannerism is also a concern. In psychology, there is a theory that intrinsic motivation is increased through internal specifics and suitable gap in each aspect of emotion, cognition, and ability for the object. In this paper, to construct a method to maintain motivation for safety management activities, we report 1) distance quantification with each worker’s internal, specific, and safety management activities and 2) the identification of suitable gap between each worker’s internal specific and safety management activities. First, we investigated 70 workers from the fields of rail and plant, and plotted each worker’s attitude from the three viewpoints stated above for each safety management activity in a space comprised of three axes, applying the Scheffe method to data provided. Furthermore, we equally quantified the degree of the motivation for each safety management activity. Secondly, we positioned a plot in the three-dimensional space of each safety management activities constructed for every worker in a scale of 0-1 on every axis of emotion, cognition, and ability. The results shows that in the above-mentioned three-dimensional space of each safety management activities, the plots with highest motivation was concentrated in a scale of 0.2-0.4 on the axes of cognition and ability. On the other hand, the higher the motivation was, the nearer the plots were on the axis of emotion.

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