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Understanding replacement behaviour is the key for exploring design solutions to achieve longer product life-spans. This chapter reports on an extensive literature review and subsequent qualitative and quantitative research intended to lead to a better understanding of replacement behaviour. The process of replacement decision making is described and a model of influencing factors presented. In general, even though people's motives for replacing products are very diverse, in essence what they want are well-functioning and up-to-date products that meet their changing needs. This requires a similar approach in design: the development of products that are dynamic and flexible. Design solutions are needed to postpone replacement, using strategies such as designing products for reliability and robustness, repair and maintenance, upgradeability, product attachment and variability. Design cases are presented …