Software testing lifecycle flowchart with decision gates spanning requirement testability review, test case design, environment setup, test execution, defect handling, and regression testing. The workflow enforces quality checkpoints at each phase—requirements must pass testability review, test cases require approval, and defects trigger regression cycles before final report review. This end-to-end process ensures comprehensive test coverage, traceability, and defect closure before archival. Fork this diagram on Diagrams.so to customize phases, add parallel testing tracks, or integrate with your CI/CD pipeline documentation. The feedback loops between defect handling and regression testing reflect real-world iterative testing practices.