Obsolescence
A product becomes obsolete when
- no longer useful - out of date - cannot be used with current technology - replaced by a more efficient product
Style Obsolescence
Relates to the changing nature of trends and fashions. Products go through regular changes in appearance and stylewhich induces people to replace the older-styled product with something more fashionable.
Technical Obsolescence
When a product becomes obsolete due to new technologies or design features/functions that are produced.
Functional Obsolescence
When manufacteres choose lower-quality materials and processes, knowing that the product will be less durable.
Planned Obsolescence
When manufacturers design a product to be obsolete within a few months or years.