Abstract
Software Development Life Cycle (SDLC) is an important concept used in software engineering to describe a procedure for planning, creating, coding, testing and implementation of user requirement specification. Software development life cycle applies to a range of hardware and software configurations. SDLC is step by step process for creating quality software for users. It involves different phases that are followed one after one, that are essential for software engineers such as planning, analysis, design, coding, testing and implementation. In the early years, hardware was costly and software relatively cheap. In digital era, hardware is cheap and software is expensive. So the costs of hardware and software have been reversed due to increased demand of well engineered software products. This paper includes different phases of SDLC, software quality, qualities of well engineered software and factors affecting software quality. Key words: SDLC, Phases, Software Quality, Factors
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