CareerCup

First ask
"Let me ask you about this elevator we are designing"
"Who will use it? Children at a school? Cleaners at a hotel? Fans at a stadium?"
"What will they use it for? Deliver? Faster access over stairs?"
"Where is the elevator being installed? 2 story building? 50 story skyscraper?"

Basically you will probably find out this is an elevator on a bus for disabled folk that will take 1 guy in a wheel chair and bring him onto the bus. Then just list the use cases, try to structure them a bit into functional/negative/load/stress/boundary etc

Assuming its an elevator used in malls,airport,public places

1)When no person is there on elevator,check the speed
2)When there are average nbr of perons,
3) When more than the specified limit
4)Check the emergency stop functionality
5)Working for both the directions(upward,downward) equally
6)What if stopped by power failure

1. Maximum capacity
2.No of buttons are present equals to number of floors
3.elevator stops to that particular floor after pressing button.4
4.chreck open and close door button is working
5.check emergancy stop functionality