The book tells about the theory of invention - a science that studies methods for solving inventive problems. The combination of the words "theory" and "invention at first glance seems strange. It is more common to meet the words "inventor" and "invention" next to the words "case," "intuition," "talent." Indeed, the theory of invention began to take shape only a few years ago. But the very idea of ​ ​ the need to understand the creative processes leading to the invention has been expressed for a long time.