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Verification vs Validation: What Each One Checks
Two separate checks, verification and validation answer different questions: does the work match the spec, and does the product match the need. Confusing them hides the gap.
Software Testing Basics: Principles, Terms, and Test Levels
The basics in testing come down to four decisions: what you are checking, at which level, what evidence you keep, and whether the result is also good enough for the person using it.