Software-development-life-cycle

The Software Development Life Cycle (SDLC) is a structured, phased approach used in the software development process to design, develop, test, deploy, and maintain software applications. It ensures quality, efficiency, and consistency in delivering software projects by breaking the development process into manageable, well-defined stages.

The 7 Phases of SDLC

  1. Planning and Requirement Analysis
    Collect detailed requirements from stakeholders and analyze feasibility, costs, and risks. This phase sets the foundation for a successful project by defining clear objectives.
  2. Requirement Specification
    Document all software needs clearly in a Software Requirement Specification (SRS) for approval to avoid miscommunication.
  3. Design
    Architect the system and finalize design documents including UI/UX wireframes, technical architecture, database designs, and integration plans.
  4. Development and Coding
    Write and compile source code using appropriate programming languages and tools following coding standards to build the software.
  5. Testing
    Perform comprehensive testing (unit, integration, system, UAT) to identify and resolve defects, ensuring functionality and performance meet requirements.
  6. Deployment
    Release the software to the production environment and prepare infrastructure, plus provide user training and documentation.
  7. Maintenance and Support
    Continuously monitor, fix bugs, update features, and improve software performance for long-term reliability and user satisfaction.

What is SDLC and Its Types?

SDLC represents the methodology through which software is developed and maintained. Different SDLC models guide how phases are executed:

ModelDescriptionAdvantagesBest for
WaterfallLinear, sequential phases completed one at a timeSimple to manage, clear milestonesProjects with fixed requirements and scope
IterativeDevelopment in repeated cycles, refining through each iterationFlexible, early partial deliveryProjects needing incremental improvements
AgileIncremental development with frequent feedback and collaborationHighly flexible, customer involvementDynamic projects with evolving requirements
SpiralRisk-driven iterative cycles combining Waterfall and prototypingStrong risk management, adaptabilityLarge, complex, high-risk projects
V-ModelExtension of Waterfall emphasizing verification and validation stagesRigorous testing aligned with phasesProjects requiring high-quality assurance
IncrementalSoftware built in increments, each delivering part of functionalityEarly partial working systemsProjects needing early deployment of components

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