V-Model in Project Management: How It Works

Quick answer

The V-Model pairs each build phase with its test phase — requirements↔acceptance, design↔system test, architecture↔integration, code↔unit test: testability designed in from the start.

The V shape

Left leg: requirements → design → architecture → code. Right leg: unit → integration → system → acceptance tests, each verifying its left twin.

The discipline

Test plans written when their spec phase is written — verification designed with the spec, not after.

Where it fits

Safety-critical, regulated engineering — automotive, medical, aerospace — where traceability is mandatory.

The cost

Rigid sequence, late feedback — the price of mandated traceability.

Bottom line

The V-Model pairs each build phase with its test phase — requirements↔acceptance, design↔system test, architecture↔integration, code↔unit test: testability designed in from the start.

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