This book is the sixth level of study of the theory of solving inventive problems (TRIZ) from the series "TRIZ from A to Z." It consists of two parts: a textbook and a problem book, made in the form of separate books. The textbook is devoted to the study of ARIZ-85-V, the last of the ARIZs created by Heinrich Altshuller. The problem book is aimed at gaining skills in solving inventive problems using ARIZ-85-V.