# Logical Data Modeling - Relationship Direction (Directed/Undirected)

### Table of Contents

## About

The direction of a relationship shows if the relationship can be interpreted in one or both directions.

There is only two options:

- directed - an asymmetric relation
- undirected - a symmetric relation.

## Articles Related

## Type

### Directed

A directed relationship models asymmetric relations (ie the relationship can be interpreted in only one direction)

It represents a Relationship between a collection of source model elements and a collection of target model elements. A Directed Relationship is said to be directed from the source elements to the target elements.

### Undirected

An Undirected relationship models a symmetric relations (ie the relationship can be interpreted in both directions)