2018 年 2 巻 2 号 p. 2_53-2_62
Product affordances comprise operational and functional affordances. These affordances serve different functions in intuitive user-product interactions. This study details the first year of a multiyear project involving intuitive interactions with product user interfaces. The project investigated the affordances and operational requirements of older users with dementia. The user interface of an electronic rice cooker was analyzed, and nine older adults with mild dementia were selected as the research subjects. A task analysis was conducted to elucidate the functional affordance requirements of various operational components for various operational tasks. A usability evaluation was conducted to determine the participants' component operation behaviors and operational affordance requirements. The evaluation results also highlighted whether the affordances of the components were perceived by the participants. Findings indicated that operational affordances must be easily perceived by users and that functional affordances should conform to users' cognitive abilities. The findings of this study can serve as a reference for developing an information system concerning component affordances that facilitate intuitive interaction. They can also serve as a reference for designing product user interfaces that promote intuitive interaction for older users with dementia.