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Software Development Life Cycle (SDLC): Meaning, Models, Cycle and Phases

Learn the Software Development Life Cycle (SDLC), common models, and practical tips for planning and delivering quality software.

Software Development Life Cycle (SDLC): Meaning, Models, Cycle and Phases visual insight

The Software Development Life Cycle (SDLC) is a structured process for planning, building, testing, and maintaining software. It helps teams deliver predictable outcomes and manage risks across projects.

Common SDLC models

  • Waterfall: sequential phases, suited to well-defined requirements.
  • Agile: iterative development with sprints, suited for changing requirements.
  • DevOps/Continuous Delivery: integrates development and operations for fast, reliable releases.
  • V-Model and Spiral: variations emphasizing testing or risk management.

SDLC phases

  • Requirement analysis and planning.
  • Design and architecture.
  • Implementation (coding).
  • Testing and QA.
  • Deployment and release.
  • Maintenance and monitoring.

Best practices

  • Define acceptance criteria early.
  • Automate testing and deployments.
  • Maintain clear documentation and code reviews.
  • Use metrics (lead time, cycle time, defect rate) to improve processes.

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