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V-Model — Verification & Validation Lifecycle
Left side decomposes; right side verifies at the same level.
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◤ ◤ DEFINITION
What it is
The V-Model pairs each decomposition activity (needs → system → subsystem → component → unit) with a corresponding verification activity (unit test → integration → system test → acceptance).
◤ ◤ PURPOSE
Why it exists
Forces every level of specification to have a matching level of evidence. You cannot pass system test if you never wrote a system spec.
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