Abstract
A precise understanding of product obsolescence is fundamental for extending product lifetimes and promoting a circular economy. Previous studies have revealed that various factors affect product obsolescence other than failure. However, very few studies have quantitatively examined the relationships between these factors and product lifetime. Therefore, this study investigated the relationship between the lifetime of consumer appliances (digital cameras, microwaves, and PCs) and the reasons for their obsolescence based on a questionnaire survey to Japanese consumers. Device failure appeared to be the major reason for product obsolescence for all products. However, consumer demand for new functions or other new device characteristics was also a significant reason for product obsolescence for digital cameras, regardless of the duration of use, as well as for microwaves during the first three years of use. These results provide useful insights for designers and manufacturers aiming to extend product lifetimes.
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