"Chance Discoveries in Real World Decision Making" is a scholarly book that explores the concept of chance discovery, which describes the identification of events that are significant for decision-making processes. The editors, Yukio Ohsawa and Shusaku Tsumoto, have compiled contributions from various research fields such as artificial intelligence, mathematics, cognitive sciences, medicine, and risk management. The authors present different approaches to chance discovery and highlight how rare or hidden events can be identified to explain their significance. The chapters of the book provide insights into predicting future trends, communication for scenario development in marketing and design, as well as identifying the effects and side effects of medications. The methods presented are based on the interaction between humans, machines, and the human living environment, representing a promising direction for computer-assisted decisions in a rapidly changing context.