Changelog

All notable changes to the Signal-Driven Development methodology.

Versioning

SDD uses methodology versioning:

• MAJOR: Breaking changes to templates, gap categories, or the convergence model
• MINOR: New templates, examples, fields, or documentation sections
• PATCH: Typo fixes, clarifications, editorial improvements

---

[1.0.0] -- 2026-03-20

Added

• Four core templates: domain specification, gap report, gap resolution log, architecture palette
• Four gap categories: Structural (SG), Heuristic (HG), Language (LG), Decision (DG)
• Three-pass convergence model with measurable definition of done
• Worked example: Greenfield Veterinary Clinic (3 passes, 18 to 0 gaps)
• Severity model: ERROR and WARNING classifications
• Heuristic thresholds sourced from Evans, Vernon, Brandolini, and Khononov
• Quick start guide and scaffolding script
• FAQ and convergence flow diagram
• MIT license