Why Model-First Architecture Documentation
Model-first architecture documentation eliminates diagram drift, enforces consistency across views, and provides a single source of truth for all architectural decisions.
Most architecture documentation starts with diagrams. Teams open a drawing tool, place boxes, draw arrows, and export an image. The diagram becomes the primary artefact. Over time, teams create more diagrams for different audiences, add schemas for API consumers, and write wiki pages for onboarding. Each artefact is authored independently, and none of them are connected. When one changes, the others do not. Diagrams diverge from each other, schemas fall out of sync with entity definitions, and there is no lineage between a component on a diagram and the entity it represents in the data model. Model-first architecture documentation solves this by making the model the source of truth, not the diagrams.
The Problem with Diagram-First
How Model-First Works
Model-First vs Diagram-First vs Wiki-First
Benefits
The central model file is the single source of truth for every entity, relationship, and property in a NeoArc project. 12 abstract database-agnostic types, 6 key roles, per-property projections for persistence, search, and API, governance classifications (PII, confidential, retention policies), shared property sets with live inheritance, 18 validation rules, and import/export across 39 formats.
Manage the full lifecycle of architectural entities with active, planned, and deprecated states, succession tracking via replaced-by and evolved-from edges, and automated impact analysis.