---
type: concept
title: Brief Document
---

The Brief Document is a markdown file with YAML frontmatter that gets turned into document metadata.  These documents are the primary user interface for the software.

# Relationships

## Brief Model

Based on the folder the document is in, or based on the type specified in the YAML frontmatter, a document will map to a `Brief Model`

## Briefcase

Every document should belong to a briefcase.  The briefcase is where the document relates to other documents, and where it gets its model rules and behaviors from.