Each instructor is responsible for finding their own sub ahead of time. If it is an emergency (sick child, personal illness, family emergency, etc) at the last minute I, as coordinator, will often be the last minute sub. If an instructor has to miss 2 or more classes in a series the sub takes over the class. We feel it is very important to provide a consistant instructor for each class. Our schedule is completed a year in advance, but all the instructors are great about helping each other out. Hope this helps!