W-Model
Updated 2026-08-09
INTRODUCTION
English translation pending.
CORE DEFINITION
The W-model builds on the V-model by adding development and testing in parallel, so that the development V plus the testing V forms the shape of a W. Testing no longer waits for development to finish; it runs alongside it from the requirements stage onward. Every level of requirements carries its own matching verification, so defects are found early when the fix is cheapest.
SCAFFOLDING EFFECT
Reduce cognitive load
- Design the tests at requirements time: write the acceptance criteria before any code. - Match each level with a test: give every layer of build its own verification. - Shift the work left: treat testing as a parallel track, not a closing phase.
Anchor fast decisions
Built on the V-model, the development V and the testing V overlap into a W, stressing that testing starts at the requirements stage and runs in parallel rather than waiting for the build to end. Each level of requirement carries its own verification, so defects surface early when the fix costs least.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/V-model_(software_developmentverified
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