Reading some quality process documents I found the following definition:
  • To detect and remove errors before the computer system is put into production
  • To demonstrate that the computer system is fit for intended use

But when we look at the ITIL definition of the value composition of a service – it looks fit for use, as above: follows the requirements, sufficient – what the customer gets. But also – at an equal base, it looks at fit for purpose: it has a positive effect on the business, it solves a business problem, solving the right problem. The product is a solution. If the problem isn’t solved, the product doesn’t work.

see also: Uncovering better ways  Softwaretesting is only dead, if it stands still I didn’t open it