Textbook for organizing independent work of students during the discipline "Mathematical methods of decision-making." The discipline "Mathematical methods of decision-making" is a mandatory discipline of the basic part of the professional cycle of the direction "Business informatics." The study of this discipline is aimed at forming theoretical information among students on the application of mathematical methods in applied decision-making problems. The textbook presents lecture material that reveals in a simple and accessible form various sections of applied mathematics from the course of decision theory for students of non-core mathematical specialties.