Least slack time scheduling is a way of organizing your tasks so that you get things done on time. With least slack time scheduling, you look at all of the tasks that need to be done, and then you figure out when each one should be finished. For each task, you figure out how much time you need to be able to finish it. Then, you schedule the tasks in order of the smallest amount of time you need to finish them. That way, the tasks that need to be done the soonest will be finished first and you will make sure everything is done within the right timeline.