This document provides guidance on how to improve retrospective meetings by making them more fun and focusing on system thinking. It recommends three key elements: more fun, system thinking, and an alternative phase model. Specific techniques are suggested such as using metaphors like a soccer game or pirate adventure to structure the retrospective. The power of causal loop diagrams and current reality trees for understanding the system is also discussed. The document advocates applying systems thinking models like the ABIDE model to help participants view their work in the context of complex interactions within the overall system.