This is the mind map I made based on the contents of the fourth chapter of The Duolingo Handbook .

The fourth chapter focuses on the concepts of showing, not telling. It is not just about the importance of communication, it is about creating a culture that moves the needle grounding decisions in evidence and real impact.

The main key points are:

• numbers are the story, basing decisions on data and evidence, not abstract narratives
• clear, concise communication to encourage clearer thinking and better decision making
• prototypes, not pitch decks to focus on the user experience and the actual impact of the product
• make it simple, because great products don’t have to explain themselves

Below the mind map.