spec-driven-development

Spec-driven development prevents costly rework by turning vague requests into a shared, testable plan before implementation starts. It is needed when requirements are unclear, ambiguous, or lack measurable outcomes for new projects and cross-module changes.

You break down ambiguous requirements by first capturing objectives, success criteria, and boundaries in a written specification, then proceeding through gated planning and task breakdown phases to guide implementation only after human validation.

You can apply this specification approach to new projects, new features, or cross-module changes. It suits any context where success is ambiguous and architectural decisions are pending, ensuring alignment before implementation starts.

The best way to define acceptance criteria and testing strategy is to create a validated specification that reframes ambiguity into concrete, measurable outcomes. This establishes what constitutes done up front, covering structure, code style, and testing boundaries.

The gated implementation workflow keeps delivery aligned by using review checkpoints across SPECIFY, PLAN, TASKS, and IMPLEMENT phases. This ensures progress is measured against the validated specification before moving to the next execution stage.