Abstract
The purpose of this research was to develop a more user friendly LED table lamp for close range illumination by considering scenarios of use of the product as noise factors in the conceptual product development stage and thereby obtain a product with greater customer satisfaction. Virtual design was employed, permitting conceptual systems to be evaluated and selected at the conceptual stage and conceptual design to be taken to a deeper level. However,everybody evaluates user friendliness or ease of use in a different way. It was hoped that effective noise factors would enable evaluations by just a few people to represent the evaluations of many, but it was found that one person's evaluation cannot represent six people's evaluations, and that not only do evaluations vary from person to person, but some people have low reliability on the evaluation criteria axis. By excluding such people from the evaluation results, an evaluation method with high reproducibility was established, and a conceptual plan for a product considered easy for many people to use was selected. This research began when the conceptual study was initiated, but it was recognized that the method needed to be applied more widely, including the upstream product planning stage that precedes conceptual study.
