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 for software life-cycle
From The Free On-line Dictionary of Computing (30 December 2018) :

  software life-cycle
      The phases a software product goes through
     between when it is conceived and when it is no longer
     available for use.  The software life-cycle typically includes
     the following: requirements analysis, design,
     construction, testing ({validation), installation, operation,
     maintenance, and retirement.
     The development process tends to run iteratively through these
     phases rather than linearly; several models (spiral, waterfall
     etc.) have been proposed to describe this process.
     Other processes associated with a software product are:
     quality assurance, marketing, sales and support.

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