Planned obsolescence or built-in obsolescence^[1] in industrial design is a policy of deliberately planning or designing a product with a limited useful life, so it will become obsolete or nonfunctional after a certain period of time.^[1] Planned obsolescence has potential benefits for a producer because to obtain continuing use of the product the consumer is under pressure to purchase again, whether from the same manufacturer (a replacement part or a newer model), or from a competitor which might also rely on planned obsolescence.^[1]
In some cases, deliberate deprecation of earlier versions of a technology is used to reduce ongoing support costs, especially in the software industry. Though this could be considered planned obselescence, it differs from the classic form in that the consumer is typically made aware of the limited support lifetime of the product as part of their licensing agreement.
For an industry, planned obsolescence stimulates demand by encouraging purchasers to buy sooner if they still want a functioning product. Built-in obsolescence is used in many different products. There is, however, the potential backlash of consumers who learn that the manufacturer invested money to make the product obsolete faster; such consumers might turn to a producer (if any exists) that offers a more durable alternative.
Planned obsolescence was first developed in the 1920s and 1930s when mass production had opened every minute aspect of the production process to exacting analysis.^{[citation needed]}
Estimates of planned obsolescence can influence a company's decisions about product engineering. Therefore the company can use the least expensive components that satisfy product lifetime projections. Such decisions are part of a broader discipline known as value engineering.

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