Task: Text Simplification
Input (English): design philosophies two basic designs exist : event-driven -lrb- priority scheduling -rrb- designs switch tasks only when an event of higher priority needs service , called pre-emptive priority.
Output (English): design philosophies . two basic designs exist : event-driven -lrb- priority scheduling -rrb- designs exchange tasks only when a more important event needs to be taken care of -lrb- called pre-emptive priority -rrb-.