This book is a work about human cognition by Herbert Simon, a famous psychologist and pioneer of artificial intelligence. This book introduces people's cognitive structure, including attention, memory, etc., And then analyzes the ways and strategies for solving problems in people's thinking process. The book further analyzes the different mental representations of experts and ordinary people for complex problems, and how to deal with complex problems. Finally, the author introduces the basic principles and processes of learning and explains how to explore and discover new rules. Whether readers are concerned about artificial intelligence or psychology, this book is a rare classic.