Class Age Groups
See if classes are separated by age and/or belt level. Adult students may not appreciate training with children, some of whom may be able to execute the techniques better than they can. You may find yourself as the only adult in a class full of much younger students, and the different maturity levels could prove distracting to both you and them.
Who teaches the classes? Does the head instructor teach most of the classes or does he or she only teach the advanced classes? If assistants teach beginner classes, what are their qualifications and experience? Ensure you watch classes taught by the person who will be teaching your class. And who will you be spending most of your class time with?
Size of School
Taekwondo schools come in all sizes. Some are part of a large chain, others are small operations run by a single instructor. The quality of instruction you will receive at a school is not necessarily related to its size. You can receive poor or excellent instruction both at a small school and at a large school. Although large schools may have better equipment and nicer facilities, smaller schools offer students more personal attention.