Diagrams are ubiquitous in management and the media. But how reliable are their use and their statements? Do they facilitate understanding or lead to confusion? Nicolas Bissantz describes how the limits of human perception and the limits of geometric representation come into conflict and how both hinder the interpretation of data. He bridges the gap between neurobiology and business administration. The book illustrates what can go wrong with numerous examples from business news and financial communication. As a solution, the author proposes a different approach to diagrams and new formats. He provides concrete rules to help avoid the described fallacies more easily. This book is the application-oriented, pragmatic summary of "Data Design" by Nicolas Bissantz. Contents: Truth does not come from perception, Diagrams at a standstill or in a dead end? The seven myths of visualizing numbers, The puzzles of seeing, Better reporting, Better style guides, Better business news, Better financial communication, Back to the number.