The retrospective is a pillar of Scrum, but prone to death by stop-start-continue if not carefully facilitated. This 10-Day Challenge provides interested technologists, and agilists with approachable experiments on their Retro formats, looking for better ways to engage the team. The experiments are built around a Team Maturity model, which is explored in context with the recommended formats for that stage of growth. Not all growth is created equal. Practice trumps lecture, and experiments are only good if you run them! Try these experiments out with your team, and learn what works for you. This book will help you and your team explore new avenues for growth and improvement. The experiments will help you learn the principles you already know even deeper! How far could you get with 10 intentional Experiments?