This document provides an overview of a workshop on using materiality matrices to assess the economic, social, and environmental concerns of a company and its stakeholders. The workshop involves researching a selected organization and creating a materiality matrix to identify and prioritize the most important sustainability issues. Participants will research a company, identify stakeholders and their concerns, and plot material issues on a matrix based on importance to both the organization and stakeholders. The materiality matrix is a useful tool for companies to establish sustainability priorities and support business cases.