TOC believes that there is at least one constraint on any system, or it may have an infinite output. Therefore, to improve the output of a system (any enterprise or organization can be regarded as a system), it is necessary to break the constraints of the system. Any system can be imagined as a series of rings, rings and rings, the strength of the system depends on its weakest link. If this constraint determines the rate at which a business or organization can achieve a goal, we must significantly increase the output of the system in a short period of time before we can overcome this constraint. The content of this course is aimed at finding constraints and improving constraints.