Iterative learning control with multiple points and final point tracking

Iterative learning control (ILC) involves the tracking of a trajectory over a finite interval, but with the introduction of new applications, scenarios emerged where tracking for whole duration is not mandatory, while tracking on specific points have more significance, so other forms of ILC emerged which are termed as point to point ILC with significance at intermediate points or specific points during the trajectory and Terminal point ILC with significance at final point. In this article, a comparison between these forms of ILC and different issues arising in the respective ILC forms are addressed and briefed.