In order to reduce mass disposal, it is necessary to design and develop products with long lifetimes. However, few studies have investigated long-life design in terms of value lifetime compared with physical lifetime. Product value consists of use value, Kansei value, and economic value, and the product value lifetime is considered to be reached when any one of these values is lost. Few studies have considered the Kansei value (that is, the perceived or emotional value of a product) and the regional differences in sensitivity to products. In this study focusing on attachment, we analyzed attachment strategies for the design of products with long value lifetimes and examined the regional differences in sensitivity to product attachment. We identified design strategies that are strongly correlated with attachment in Vietnam and Thailand. We also found that Japanese users are less attached to their products than users in Vietnam and Thailand. The findings of this study will contribute to the design of long-life products with high Kansei values.

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