We often find ourselves in complex situations without recognizing what makes them complex. Yet, only understanding the context will help us to either benefit from the complex situation (yes, it can also be beneficial) or know how to reduce the complexity. In this workshop, we will introduce a simple tool (the difference matrix of Human Systems Dynamics, HSD in short) that helps to see the differences and exchanges that at the same time make a situation complex and provide hints for reducing the complexity. Using a case study, participants will experience in small groups (using breakout rooms) how they can use the difference matrix by example.