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In the IEEE Standard Glossary of Software Engineering Terminology the Software Life-Cycle is: The period of time that starts when a software product is conceived and ends when the product is no longer available for use. The software Life-Cycle typically includes a requirements phase, design phase, implementation phase, test phase, installation and check-out phase, operation and maintenance phase, and sometimes, retirement phase. (IEEE, 1995)

Software Life-Cycle Model is the blueprint of activities that occur during software development. Some software Life-Cycle has a series of phases which help managing the development of the project. It helps the developers understand the basic activities and characteristics of the project during development. It describe the period from the time a software product is conceived, and ending when the product no longer performs the functions for which it was designed. The software Life-Cycle is typically decomposed into various phases, such as requirements elicitation, analysis, design, programming, testing, installation and maintenance.