Spec-Driven Development
How executable specifications turn requirements into living documentation and regression protection.
The Problem with Traditional Specs
Requirements documents are written in prose. Developers interpret them. QA tests them. Six months later, the spec is out of sync with the code.
Spec-Driven Development flips this: write executable specifications first, then implement the behavior that makes them pass.
From Requirements to Confidence
A good specification describes behavior in terms that both people and tools can understand. It becomes a shared agreement about what the system should do, while its executable form provides immediate feedback when the implementation changes.
Living Documentation
When specifications run as part of the development workflow, they stay close to the behavior they describe. The result is documentation that is checked continuously instead of being maintained as a separate artifact.
Why It Matters
Spec-Driven Development gives teams a clearer way to discuss requirements, a faster way to detect regressions, and proof that important behavior still works. In regulated domains, that evidence is especially valuable.