Testing typically occurs in hierarchical stages to catch errors as early as possible:
: A flaw in the software that causes it to deviate from its expected behavior. Levels of Testing Software Testing
: A detailed set of conditions, steps, and expected results used to validate a specific functionality. Testing typically occurs in hierarchical stages to catch
: Final verification (often by the user) to determine if the system is ready for deployment. Software Testing
(PDF) Software Testing Techniques and Strategies - ResearchGate