COMMERCIAL LIFE CYCLEThe software life cycle is the term used to describe the phases involved in the process of creating, testing, and releasing new commercial software products. This cycle is similar to the process used in developing information systems, except that in this case the cycle focuses on the creation and release of a software program, not the development of a customized information system. The commercial software life cycle is repeated every time a new version of a program is needed. The phases in the software life cycle include the following: proposal and planning, design, implementation, testing, and public release.PROPOSAL AND PLANNINGIn the proposal and planning phase of a new software product, software developers will describe the proposed software program and what it is supposed to accomplish. In the case of existing software, the
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