At a high level, I beleive VW uses the V-model. Everything implemented should tie back to a high level requirement, and it should have been verified.<p><a href="https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;V-Model" rel="nofollow">https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;V-Model</a>