Software Testing Life Cycle (STLC) Explained in 7 Phases

The software testing lifecycle (STLC) is a structured, repeatable process for planning, conducting, and closing software testing activities, distinct from the broader software development lifecycle because it produces evidence of quality rather than working code. Its seven phases are requirement analysis, test planning, test case development, test environment setup, test execution, defect reporting and retesting, and test cycle closure, with each phase defined by entry and exit criteria and deliverables such as traceability matrices, test plans, execution logs, defect reports, and closure reports. The approach emphasizes traceability from requirements through coverage results, stable and smoke-tested environments, actionable defect reporting, regression testing, and formal sign-off to make testing effort measurable and improve future cycles. In agile and continuous-testing environments, these phases are compressed or run in parallel rather than eliminated, with automation commonly applied to test data generation, environment provisioning, recurring high-risk tests, CI/CD execution, and cross-browser or device coverage, while exploratory testing, usability assessment, and retrospectives remain human-led. Useful measures include requirement coverage, defect density and escape rate, execution time, rerun rates, and effort against estimates, while the article also presents Sauce Labs as a platform for AI-assisted test authoring, cloud-based parallel testing, failure analysis, release feedback, and production monitoring.

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