Arden Syntax

Arden Syntax is a medical knowledge representation language designed for writing Medical Logic Modules (MLMs), reusable pieces of clinical decision logic. Think of it as a way to encode medical knowledge so that computers can reason with it and support clinicians in real time.

Completely new to Arden Syntax?

Check out our beginner’s guide here, where we walk you through the basics step by step:

• What an MLM (Medical Logic Module) looks like

• How to write your first rule in Arden Syntax

• Examples you can copy, run, and tweak

Guides

Hands-on, step-by-step tutorials focused on real-world tasks — from writing your first Medical Logic Module (MLM) to handling data exchange, building fuzzy logic workflows, and more. Each guide includes clear examples and practical tips to help you apply Arden in clinical contexts.

References

In-depth explanations of the building blocks of Arden Syntax. They are are written with the practical concerns of knowledge engineers in mind, highlighting useful patterns and insights.

Further Learning

Explore our interactive beginner-friendly tutorial to practice writing MLMs, or browse the complete Arden Syntax Standard for the full technical specification.