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The period of time that begins when a software product is conceived and ends when the software is no longer available for use. [ ISO/IEC/IEEE 24765 ]
Software Life Cycle [ IEEE 1074 ]: The project-specific sequence of activities that is created by mapping the activities of this standard onto a
selected software life cycle model (SLCM).
Software Life Cycle [ IEEE 1362 ]: The system or product cycle initiated by a user need or a perceived customer need and terminated by discontinued use of the product.