1. The problem statement, all variables and given/known data The coursework i'm doing is about the efficiency of elevators. It's simple enough, but I have to outline some points in my coursework summary and there's nothing relevant to them on the internet. 2. Relevant equations N/A 3. The attempt at a solution One of the questions is "Outline the problems that need to be overcome when installing elevators in very tall skyscrapers" There's no resources i can refer to in books or on the internet. I'm really not sure what they're looking for.