: Final verification (often by the user) to determine if the system is ready for deployment.
: Ensuring that different software modules work together effectively. Software Testing
(PDF) Software Testing Techniques and Strategies - ResearchGate : Final verification (often by the user) to
Testing typically occurs in hierarchical stages to catch errors as early as possible: Software Testing
: Testing the complete, integrated system to verify end-to-end performance and functionality.
: Validating the smallest testable components (functions or classes) in isolation.