1. Check to see if it works with a valid ID. 2. Does not let in someone with an invalid id or with no ID. 3. Allows people to exit freely. 4. Height of the turnstop should be at an optimal level to not harm kids trying to enter. 5. How many seconds before it locks up again! 6. How many card reads can the reader handle. 7. How do you release a person if the turnstop malfunctions and the person is caught midway or something.. 8. Use your creativity to come up with more.