SDLC Explained: Phases, Agile vs Waterfall, and Why Process Drives Software Quality

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The Software Development Life Cycle (SDLC) is a structured framework that guides teams through seven phases — planning, requirements analysis, design, implementation, testing, deployment, and maintenance — to deliver software reliably. Understanding the SDLC is considered essential for anyone building or commissioning software, as the quality of the process directly affects cost, timeliness, and the final product. Two dominant approaches govern how teams move through these phases: Waterfall follows a strict sequential order, while Agile uses iterative short cycles that allow frequent releases and greater flexibility. Experts note that most software project failures stem not from poor coding but from weak early phases, particularly vague or misunderstood requirements. A disciplined SDLC helps manage risk and control costs by identifying problems early, when they are least expensive to fix.

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