# Module 3: Arup Risk Ratings
Recommended for: Analysts
This module provides foundational background about the Arup risk ratings, which are used to consistently communicate risk across the Iris platform. Video A reviews common risk metrics, Video B explains how to calculate average annual loss, Video C introduces the Arup risk rating tables, Video D provides guidance for combining risks from multiple hazards in terms of their risk ratings, Video E summarizes a few rules for developing custom risk rating tables based on client requests.